AT45DB081E [ETC]
8-Mbit DataFlash (with Extra 256-Kbits), 1.65V Minimum SPI Serial Flash Memory; 8 - Mbit的数据闪存（带额外的256千位） ，最小1.65V的SPI串行闪存
| 型号： | AT45DB081E |
| 厂家： | 
ETC |
| 描述： | 8-Mbit DataFlash (with Extra 256-Kbits), 1.65V Minimum SPI Serial Flash Memory |
| 文件： | 总69页 (文件大小：2861K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT45DB081E
8-Mbit DataFlash (with Extra 256-Kbits), 1.65V Minimum
SPI Serial Flash Memory
PRELIMINARY DATASHEET
Features
Single 1.65V - 3.6V supply
Serial Peripheral Interface (SPI) compatible
Supports SPI modes 0 and 3
Supports RapidS™ operation
Continuous read capability through entire array
Up to 85MHz
Low-power read option up to 15MHz
Clock-to-output time (tV) of 6ns maximum
User configurable page size
256 bytes per page
264 bytes per page (default)
Page size can be factory pre-configured for 256 bytes
Two fully independent SRAM data buffers (256/264 bytes)
Allows receiving data while reprogramming the main memory array
Flexible programming options
Byte/Page Program (1 to 256/264 bytes) directly into main memory
Buffer Write
Buffer to Main Memory Page Program
Flexible erase options
Page Erase (256/264 bytes)
Block Erase (2KB)
Sector Erase (64KB)
Chip Erase (8-Mbits)
Program and Erase Suspend/Resume
Advanced hardware and software data protection features
Individual sector protection
Individual sector lockdown to make any sector permanently read-only
128-byte, One-Time Programmable (OTP) Security Register
64 bytes factory programmed with a unique identifier
64 bytes user programmable
Hardware and software controlled reset options
JEDEC Standard Manufacturer and Device ID Read
Low-power dissipation
400nA Ultra-Deep Power-Down current (typical)
4.5μA Deep Power-Down current (typical)
25μA Standby current (typical)
11mA Active Read current (typical at 20MHz)
Endurance: 100,000 program/erase cycles per page minimum
Data retention: 20 years
Complies with full industrial temperature range
Green (Pb/Halide-free/RoHS compliant) packaging options
8-lead SOIC (0.150" wide and 0.208" wide)
8-pad Ultra-thin DFN (5 x 6 x 0.6mm)
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Description
The AT45DB081E is a 1.65V minimum, serial-interface sequential access Flash memory ideally suited for a wide variety
of digital voice, image, program code, and data storage applications. The AT45DB081E also supports the RapidS serial
interface for applications requiring very high speed operation. Its 8,650,752 bits of memory are organized as 4,096 pages
of 256 bytes or 264 bytes each. In addition to the main memory, the AT45DB081E also contains two SRAM buffers of
256/264 bytes each. The buffers allow receiving of data while a page in the main memory is being reprogrammed.
Interleaving between both buffers can dramatically increase a system's ability to write a continuous data stream. In
addition, the SRAM buffers can be used as additional system scratch pad memory, and E2PROM emulation (bit or byte
alterability) can be easily handled with a self-contained three step read-modify-write operation.
Unlike conventional Flash memories that are accessed randomly with multiple address lines and a parallel interface, the
DataFlash® uses a serial interface to sequentially access its data. The simple sequential access dramatically reduces
active pin count, facilitates simplified hardware layout, increases system reliability, minimizes switching noise, and
reduces package size. The device is optimized for use in many commercial and industrial applications where
high-density, low-pin count, low-voltage, and low-power are essential.
To allow for simple in-system re-programmability, the AT45DB081E does not require high input voltages for
programming. The device operates from a single 1.65V to 3.6V power supply for the erase and program and read
operations. The AT45DB081E is enabled through the Chip Select pin (CS) and accessed via a 3-wire interface consisting
of the Serial Input (SI), Serial Output (SO), and the Serial Clock (SCK).
All programming and erase cycles are self-timed.
1.
Pin Configurations and Pinouts
Figure 1-1. Pinouts
8-lead SOIC
Top View
8-pad UDFN
Top View
SI
SCK
RESET
CS
1
8
7
6
5
SO
GND
SI
SCK
RESET
CS
1
2
3
4
8
7
6
5
SO
GND
V
CC
WP
2
3
4
V
CC
WP
Note: 1. The metal pad on the bottom of the UDFN package is not internally connected to a voltage potential.
This pad can be a “no connect” or connected to GND.
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Table 1-1. Pin Configurations
Asserted
State
Symbol
Name and Function
Type
Chip Select: Asserting the CS pin selects the device. When the CS pin is deasserted, the
device will be deselected and normally be placed in the standby mode (not Deep Power-Down
mode) and the output pin (SO) will be in a high-impedance state. When the device is
deselected, data will not be accepted on the input pin (SI).
CS
Low
Input
A high-to-low transition on the CS pin is required to start an operation and a low-to-high
transition is required to end an operation. When ending an internally self-timed operation such
as a program or erase cycle, the device will not enter the standby mode until the completion of
the operation.
Serial Clock: This pin is used to provide a clock to the device and is used to control the flow of
data to and from the device. Command, address, and input data present on the SI pin is
always latched on the rising edge of SCK, while output data on the SO pin is always clocked
out on the falling edge of SCK.
SCK
—
Input
Serial Input: The SI pin is used to shift data into the device. The SI pin is used for all data input
including command and address sequences. Data on the SI pin is always latched on the rising
edge of SCK. Data present on the SI pin will be ignored whenever the device is deselected (CS
is deasserted).
SI
—
—
Input
Serial Output: The SO pin is used to shift data out from the device. Data on the SO pin is
always clocked out on the falling edge of SCK. The SO pin will be in a high-impedance state
whenever the device is deselected (CS is deasserted).
SO
Output
Write Protect: When the WP pin is asserted, all sectors specified for protection by the Sector
Protection Register will be protected against program and erase operations regardless of
whether the Enable Sector Protection command has been issued or not. The WP pin functions
independently of the software controlled protection method. After the WP pin goes low, the
contents of the Sector Protection Register cannot be modified.
If a program or erase command is issued to the device while the WP pin is asserted, the device
will simply ignore the command and perform no operation. The device will return to the idle
state once the CS pin has been deasserted. The Enable Sector Protection command and the
Sector Lockdown command, however, will be recognized by the device when the WP pin is
asserted.
WP
Low
Input
The WP pin is internally pulled-high and may be left floating if hardware controlled protection
will not be used. However, it is recommended that the WP pin also be externally connected to
V
CC whenever possible.
Reset: A low state on the reset pin (RESET) will terminate the operation in progress and reset
the internal state machine to an idle state. The device will remain in the reset condition as long
as a low level is present on the RESET pin. Normal operation can resume once the RESET pin
is brought back to a high level.
RESET
Low
Input
The device incorporates an internal power-on reset circuit, so there are no restrictions on the
RESET pin during power-on sequences. If this pin and feature is not utilized, then it is
recommended that the RESET pin be driven high externally.
Device Power Supply: The VCC pin is used to supply the source voltage to the device.
Operations at invalid VCC voltages may produce spurious results and should not be attempted.
VCC
—
—
Power
Ground: The ground reference for the power supply. GND should be connected to the system
ground.
GND
Ground
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2.
Block Diagram
Figure 2-1. Block Diagram
WP
Flash Memory Array
Page (256/264 bytes)
Buffer 1 (256/264 bytes)
Buffer 2 (256/264 bytes)
SCK
CS
RESET
I/O Interface
V
CC
GND
SI
SO
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3.
Memory Array
To provide optimal flexibility, the AT45DB081E memory array is divided into three levels of granularity comprising of
sectors, blocks, and pages. Figure 3-1, Memory Architecture Diagram illustrates the breakdown of each level and details
the number of pages per sector and block. Program operations to the DataFlash can be done at the full page level or at
the byte level (a variable number of bytes). The erase operations can be performed at the chip, sector, block, or page
level.
Figure 3-1. Memory Architecture Diagram
Sector Architecture
Block Architecture
Page Architecture
Block 0
Block 1
Block 2
8 Pages
Page 0
Sector 0a
Sector 0a = 8 pages
2,048/2,112 bytes
Page 1
Sector 0b = 248 pages
63,488/65,472 bytes
Page 6
Page 7
Page 8
Page 9
Block 30
Block 31
Block 32
Block 33
Sector 1 = 256 pages
65,536/67,584 bytes
Sector 2 = 256 pages
65,536/67,584 bytes
Page 14
Page 15
Page 16
Page 17
Page 18
Block 62
Block 63
Block 64
Block 65
Sector 14 = 256 pages
65,536/67,584 bytes
Sector 15 = 256 pages
65,536/67,584 bytes
Block 510
Block 511
Page 4,094
Page 4,095
Block = 2,048/2,112 bytes
Page = 256/264 bytes
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4.
Device Operation
The device operation is controlled by instructions from the host processor. The list of instructions and their associated
opcodes are contained in Table 15-1 on page 40 through Table 15-4 on page 41. A valid instruction starts with the falling
edge of CS followed by the appropriate 8-bit opcode and the desired buffer or main memory address location. While the
CS pin is low, toggling the SCK pin controls the loading of the opcode and the desired buffer or main memory address
location through the SI (Serial Input) pin. All instructions, addresses, and data are transferred with the Most Significant
Bit (MSB) first.
Three address bytes are used to address memory locations in either the main memory array or in one of the SRAM
buffers. The three address bytes will be comprised of a number of dummy bits and a number of actual device address
bits, with the number of dummy bits varying depending on the operation being performed and the selected device page
size. Buffer addressing for the standard DataFlash page size (264 bytes) is referenced in the datasheet using the
terminology BFA8 - BFA0 to denote the 9 address bits required to designate a byte address within a buffer. The main
memory addressing is referenced using the terminology PA11 - PA0 and BA8 - BA0, where PA11 - PA0 denotes the
12 address bits required to designate a page address, and BA8 - BA0 denotes the 9 address bits required to designate a
byte address within the page. Therefore, when using the standard DataFlash page size, a total of 21 address bits are
used.
For the “power of 2” binary page size (256 bytes), the buffer addressing is referenced in the datasheet using the
conventional terminology BFA7 - BFA0 to denote the 8 address bits required to designate a byte address within a buffer.
Main memory addressing is referenced using the terminology A19 - A0, where A19 - A8 denotes the 12 address bits
required to designate a page address, and A7 - A0 denotes the 8 address bits required to designate a byte address
within a page. Therefore, when using the binary page size, a total of 20 address bits are used.
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5.
Read Commands
By specifying the appropriate opcode, data can be read from the main memory or from either one of the two SRAM data
buffers. The DataFlash supports RapidS protocols for Mode 0 and Mode 3. Please see Section 25., Detailed Bit-level
Read Waveforms: RapidS Mode 0/Mode 3 diagrams in this datasheet for details on the clock cycle sequences for each
mode.
5.1
Continuous Array Read (Legacy Command: E8h Opcode)
By supplying an initial starting address for the main memory array, the Continuous Array Read command can be utilized to
sequentially read a continuous stream of data from the device by simply providing a clock signal; no additional addressing
information or control signals need to be provided. The DataFlash incorporates an internal address counter that will
automatically increment on every clock cycle, allowing one continuous read from memory to be performed without the
need for additional address sequences. To perform a Continuous Array Read using the standard DataFlash page size
(264 bytes), an opcode of E8h must be clocked into the device followed by three address bytes (which comprise the 24-bit
page and byte address sequence) and four dummy bytes. The first 12 bits (PA11 - PA0) of the 21-bit address sequence
specify which page of the main memory array to read and the last 9 (BA8 - BA0) of the 21-bit address sequence specify
the starting byte address within the page. To perform a Continuous Array Read using the binary page size
(256 bytes), an opcode of E8h must be clocked into the device followed by three address bytes and four dummy bytes.
The first 12 bits (A19 - A8) of the 20-bit address sequence specify which page of the main memory array to read and the
last 8 bits (A7 - A0) of the 20-bit address sequence specify the starting byte address within the page. The dummy bytes
that follow the address bytes are needed to initialize the read operation. Following the dummy bytes, additional clock
pulses on the SCK pin will result in data being output on the SO (serial output) pin.
The CS pin must remain low during the loading of the opcode, the address bytes, the dummy bytes, and the reading of
data. When the end of a page in the main memory is reached during a Continuous Array Read, the device will continue
reading at the beginning of the next page with no delays incurred during the page boundary crossover (the crossover from
the end of one page to the beginning of the next page). When the last bit in the main memory array has been read, the
device will continue reading back at the beginning of the first page of memory. As with crossing over page boundaries, no
delays will be incurred when wrapping around from the end of the array to the beginning of the array.
A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO). The maximum
SCK frequency allowable for the Continuous Array Read is defined by the fCAR1 specification. The Continuous Array Read
bypasses the data buffers and leaves the contents of the buffers unchanged.
Warning:
This command is not recommended for new designs.
5.2
Continuous Array Read (High Frequency Mode: 1Bh Opcode)
This command can be used to read the main memory array sequentially at the highest possible operating clock
frequency up to the maximum specified by fCAR4. To perform a Continuous Array Read using the standard DataFlash
page size (264 bytes), the CS pin must first be asserted, and then an opcode of 1Bh must be clocked into the device
followed by three address bytes and two dummy bytes. The first 12 bits (PA11 - PA0) of the 21-bit address sequence
specify which page of the main memory array to read and the last 9 bits (BA8 - BA0) of the 21-bit address sequence
specify the starting byte address within the page. To perform a Continuous Array Read using the binary page size (256
bytes), the opcode 1Bh must be clocked into the device followed by three address bytes (A19 - A0) and two dummy
bytes. Following the dummy bytes, additional clock pulses on the SCK pin will result in data being output on the SO
(Serial Output) pin.
The CS pin must remain low during the loading of the opcode, the address bytes, the dummy bytes, and the reading of
data. When the end of a page in the main memory is reached during a Continuous Array Read, the device will continue
reading at the beginning of the next page with no delays incurred during the page boundary crossover (the crossover
from the end of one page to the beginning of the next page). When the last bit in the main memory array has been read,
the device will continue reading back at the beginning of the first page of memory. As with crossing over page
boundaries, no delays will be incurred when wrapping around from the end of the array to the beginning of the array.
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A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO). The maximum
SCK frequency allowable for the Continuous Array Read is defined by the fCAR4 specification. The Continuous Array
Read bypasses both data buffers and leaves the contents of the buffers unchanged.
5.3
Continuous Array Read (High Frequency Mode: 0Bh Opcode)
This command can be used to read the main memory array sequentially at higher clock frequencies up to the maximum
specified by fCAR1. To perform a Continuous Array Read using the standard DataFlash page size (264 bytes), the CS pin
must first be asserted, and then an opcode of 0Bh must be clocked into the device followed by three address bytes and
one dummy byte. The first 12 bits (PA11 - PA0) of the 21-bit address sequence specify which page of the main memory
array to read and the last 9 bits (BA8 - BA0) of the 21-bit address sequence specify the starting byte address within the
page. To perform a Continuous Array Read using the binary page size (256 bytes), the opcode 0Bh must be clocked into
the device followed by three address bytes (A19 - A0) and one dummy byte. Following the dummy byte, additional clock
pulses on the SCK pin will result in data being output on the SO pin.
The CS pin must remain low during the loading of the opcode, the address bytes, the dummy byte, and the reading of
data. When the end of a page in the main memory is reached during a Continuous Array Read, the device will continue
reading at the beginning of the next page with no delays incurred during the page boundary crossover (the crossover
from the end of one page to the beginning of the next page). When the last bit in the main memory array has been read,
the device will continue reading back at the beginning of the first page of memory. As with crossing over page
boundaries, no delays will be incurred when wrapping around from the end of the array to the beginning of the array.
A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO). The maximum
SCK frequency allowable for the Continuous Array Read is defined by the fCAR1 specification. The Continuous Array
Read bypasses both data buffers and leaves the contents of the buffers unchanged.
5.4
Continuous Array Read (Low Frequency Mode: 03h Opcode)
This command can be used to read the main memory array sequentially at lower clock frequencies up to maximum
specified by fCAR2. Unlike the previously described read commands, this Continuous Array Read command for the lower
clock frequencies does not require the clocking in of dummy bytes after the address byte sequence. To perform a
Continuous Array Read using the standard DataFlash page size (264 bytes), the CS pin must first be asserted, and then
an opcode of 03h must be clocked into the device followed by three address bytes. The first 12 bits (PA11 - PA0) of the
21-bit address sequence specify which page of the main memory array to read and the last 9 bits (BA8 - BA0) of the
address sequence specify the starting byte address within the page. To perform a Continuous Array Read using the
binary page size (256 bytes), the opcode 03h must be clocked into the device followed by three address bytes (A19 -
A0). Following the address bytes, additional clock pulses on the SCK pin will result in data being output on the SO pin.
The CS pin must remain low during the loading of the opcode, the address bytes, and the reading of data. When the end
of a page in the main memory is reached during a Continuous Array Read, the device will continue reading at the
beginning of the next page with no delays incurred during the page boundary crossover (the crossover from the end of
one page to the beginning of the next page). When the last bit in the main memory array has been read, the device will
continue reading back at the beginning of the first page of memory. As with crossing over page boundaries, no delays will
be incurred when wrapping around from the end of the array to the beginning of the array.
A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO). The maximum
SCK frequency allowable for the Continuous Array Read is defined by the fCAR2 specification. The Continuous Array
Read bypasses both data buffers and leaves the contents of the buffers unchanged.
5.5
Continuous Array Read (Low Power Mode: 01h Opcode)
This command is ideal for applications that want to minimize power consumption and do not need to read the memory
array at high frequencies. Like the 03h opcode, this Continuous Array Read command allows reading the main memory
array sequentially without the need for dummy bytes to be clocked in after the address byte sequence. The memory can
be read at clock frequencies up to maximum specified by fCAR3. To perform a Continuous Array Read using the standard
DataFlash page size (264 bytes), the CS pin must first be asserted, and then an opcode of 01h must be clocked into the
device followed by three address bytes. The first 12 bits (PA11 - PA0) of the 21-bit address sequence specify which page
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of the main memory array to read and the last 9 bits (BA8 - BA0) of the 21-bit address sequence specify the starting byte
address within the page. To perform a Continuous Array Read using the binary page size (256 bytes), the opcode 01h
must be clocked into the device followed by three address bytes (A19 - A0). Following the address bytes, additional clock
pulses on the SCK pin will result in data being output on the SO pin.
The CS pin must remain low during the loading of the opcode, the address bytes, and the reading of data. When the end
of a page in the main memory is reached during a Continuous Array Read, the device will continue reading at the
beginning of the next page with no delays incurred during the page boundary crossover (the crossover from the end of
one page to the beginning of the next page). When the last bit in the main memory array has been read, the device will
continue reading back at the beginning of the first page of memory. As with crossing over page boundaries, no delays will
be incurred when wrapping around from the end of the array to the beginning of the array.
A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO). The maximum
SCK frequency allowable for the Continuous Array Read is defined by the fCAR3 specification. The Continuous Array
Read bypasses both data buffers and leaves the contents of the buffers unchanged.
5.6
Main Memory Page Read
A Main Memory Page Read allows the reading of data directly from a single page in the main memory, bypassing both of
the data buffers and leaving the contents of the buffers unchanged. To start a page read using the standard DataFlash
page size (264 bytes), an opcode of D2h must be clocked into the device followed by three address bytes (which
comprise the 21-bit page and byte address sequence) and four dummy bytes. The first 12 bits (PA11 - PA0) of the 21-bit
address sequence specify the page in main memory to be read and the last 9 bits (BA8 - BA0) of the 21-bit address
sequence specify the starting byte address within that page. To start a page read using the binary page size (256 bytes),
the opcode D2h must be clocked into the device followed by three address bytes and four dummy bytes. The first 12 bits
(A19 - A8) of the 20-bit address sequence specify which page of the main memory array to read, and the last 8 bits (A7 -
A0) of the 20-bit address sequence specify the starting byte address within that page. The dummy bytes that follow the
address bytes are sent to initialize the read operation. Following the dummy bytes, the additional pulses on SCK result in
data being output on the SO (serial output) pin.
The CS pin must remain low during the loading of the opcode, the address bytes, the dummy bytes, and the reading of
data. Unlike the Continuous Array Read command, when the end of a page in main memory is reached, the device will
continue reading back at the beginning of the same page rather than the beginning of the next page.
A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO). The maximum
SCK frequency allowable for the Main Memory Page Read is defined by the fSCK specification. The Main Memory Page
Read bypasses both data buffers and leaves the contents of the buffers unchanged.
5.7
Buffer Read
The SRAM data buffers can be accessed independently from the main memory array, and utilizing the Buffer Read
command allows data to be sequentially read directly from either one of the buffers. Four opcodes, D4h or D1h for
Buffer 1 and D6h or D3h for Buffer 2, can be used for the Buffer Read command. The use of each opcode depends on
the maximum SCK frequency that will be used to read data from the buffers. The D4h and D6h opcode can be used at
any SCK frequency up to the maximum specified by fCAR1 while the D1h and D3h opcode can be used for lower
frequency read operations up to the maximum specified by fCAR2
.
To perform a Buffer Read using the standard DataFlash buffer size (264 bytes), the opcode must be clocked into the
device followed by three address bytes comprised of 15 dummy bits and 9 buffer address bits (BFA8 - BFA0). To perform
a Buffer Read using the binary buffer size (256 bytes), the opcode must be clocked into the device followed by three
address bytes comprised of 16 dummy bits and 8 buffer address bits (BFA7 - BFA0). Following the address bytes, one
dummy byte must be clocked into the device to initialize the read operation if using opcodes D4h or D6h. The CS pin
must remain low during the loading of the opcode, the address bytes, the dummy byte (if using opcodes D4h or D6h),
and the reading of data. When the end of a buffer is reached, the device will continue reading back at the beginning of
the buffer. A low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin (SO).
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6.
Program and Erase Commands
6.1
Buffer Write
Utilizing the Buffer Write command allows data clocked in from the SI pin to be written directly into either one of the
SRAM data buffers.
To load data into a buffer using the standard DataFlash buffer size (264 bytes), an opcode of 84h for Buffer 1 or 87h for
Buffer 2 must be clocked into the device followed by three address bytes comprised of 15 dummy bits and 9 buffer
address bits (BFA8 - BFA0). The 9 buffer address bits specify the first byte in the buffer to be written.
To load data into a buffer using the binary buffer size (256 bytes), an opcode of 84h for Buffer 1 or 87h for Buffer 2, must
be clocked into the device followed by 16 dummy bits and 8 buffer address bits (BFA7 - BFA0). The 8 buffer address bits
specify the first byte in the buffer to be written.
After the last address byte has been clocked into the device, data can then be clocked in on subsequent clock cycles. If
the end of the data buffer is reached, the device will wrap around back to the beginning of the buffer. Data will continue to
be loaded into the buffer until a low-to-high transition is detected on the CS pin.
6.2
Buffer to Main Memory Page Program with Built-In Erase
The Buffer to Main Memory Page Program with Built-In Erase command allows data that is stored in one of the SRAM
buffers to be written into an erased or programmed page in the main memory array. It is not necessary to pre-erase the
page in main memory to be written because this command will automatically erase the selected page prior to the
program cycle.
To perform a Buffer to Main Memory Page Program with Built-In Erase using the standard DataFlash page size
(264 bytes), an opcode of 83h for Buffer 1 or 86h for Buffer 2 must be clocked into the device followed by three address
bytes comprised of 3 dummy bits, 12 page address bits (PA11 - PA0) that specify the page in the main memory to be
written, and 9 dummy bits.
To perform a Buffer to Main Memory Page Program with Built-In Erase using the binary page size (256 bytes), an opcode
of 83h for Buffer 1 or 86h for Buffer 2 must be clocked into the device followed by three address bytes comprised of 4
dummy bits, 12 page address bits (A19 - A8) that specify the page in the main memory to be written, and 8 dummy bits.
When a low-to-high transition occurs on the CS pin, the device will first erase the selected page in main memory (the
erased state is a Logic 1) and then program the data stored in the appropriate buffer into that same page in main
memory. Both the erasing and the programming of the page are internally self-timed and should take place in a
maximum time of tEP. During this time, the RDY/BUSY bit in the Status Register will indicate that the device is busy.
The device also incorporates an intelligent erase and program algorithm that can detect when a byte location fails to
erase or program properly. If an erase or programming error arises, it will be indicated by the EPE bit in the Status
Register.
6.3
Buffer to Main Memory Page Program without Built-In Erase
The Buffer to Main Memory Page Program without Built-In Erase command allows data that is stored in one of the SRAM
buffers to be written into a pre-erased page in the main memory array. It is necessary that the page in main memory to be
written be previously erased in order to avoid programming errors.
To perform a Buffer to Main Memory Page Program without Built-In Erase using the standard DataFlash page size
(264 bytes), an opcode of 88h for Buffer 1 or 89h for Buffer 2 must be clocked into the device followed by three address
bytes comprised of 3 dummy bits, 12 page address bits (PA11 - PA0) that specify the page in the main memory to be
written, and 9 dummy bits.
To perform a Buffer to Main Memory Page Program using the binary page size (256 bytes), an opcode of 88h for Buffer
1 or 89h for Buffer 2 must be clocked into the device followed by three address bytes comprised of 4 dummy bits,
12 page address bits (A19 - A8) that specify the page in the main memory to be written, and 8 dummy bits.
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When a low-to-high transition occurs on the CS pin, the device will program the data stored in the appropriate buffer into
the specified page in the main memory. The page in main memory that is being programmed must have been previously
erased using one of the erase commands (Page Erase, Block Erase, Sector Erase, or Chip Erase). The programming of
the page is internally self-timed and should take place in a maximum time of tP. During this time, the RDY/BUSY bit in the
Status Register will indicate that the device is busy.
The device also incorporates an intelligent programming algorithm that can detect when a byte location fails to program
properly. If a programming error arises, it will be indicated by the EPE bit in the Status Register.
6.4
Main Memory Page Program through Buffer with Built-In Erase
The Main Memory Page Program through Buffer with Built-In Erase command combines the Buffer Write and Buffer to
Main Memory Page Program with Built-In Erase operations into a single operation to help simplify application firmware
development. With the Main Memory Page Program through Buffer with Built-In Erase command, data is first clocked
into either Buffer 1 or Buffer 2, the addressed page in memory is then automatically erased, and then the contents of the
appropriate buffer are programmed into the just-erased main memory page.
To perform a Main Memory Page Program through Buffer using the standard DataFlash page size (264 bytes), an
opcode of 82h for Buffer 1 or 85h for Buffer 2 must first be clocked into the device followed by three address bytes
comprised of 3 dummy bits, 12 page address bits (PA11 - PA0) that specify the page in the main memory to be written,
and 9 buffer address bits (BFA8 - BFA0) that select the first byte in the buffer to be written.
To perform a Main Memory Page Program through Buffer using the binary page size (256 bytes), an opcode of 82h for
Buffer 1 or 85h for Buffer 2 must first be clocked into the device followed by three address bytes comprised of 4 dummy
bits, 12 page address bits (A19 - A8) that specify the page in the main memory to be written, and 8 buffer address bits
(BFA7 - BFA0) that select the first byte in the buffer to be written.
After all address bytes have been clocked in, the device will take data from the input pin (SI) and store it in the specified
data buffer. If the end of the buffer is reached, the device will wrap around back to the beginning of the buffer. When
there is a low-to-high transition on the CS pin, the device will first erase the selected page in main memory (the erased
state is a Logic 1) and then program the data stored in the buffer into that main memory page. Both the erasing and the
programming of the page are internally self-timed and should take place in a maximum time of tEP. During this time, the
RDY/BUSY bit in the Status Register will indicate that the device is busy.
The device also incorporates an intelligent erase and programming algorithm that can detect when a byte location fails to
erase or program properly. If an erase or program error arises, it will be indicated by the EPE bit in the Status Register.
6.5
Main Memory Byte/Page Program through Buffer 1 without Built-In Erase
The Main Memory Byte/Page Program through Buffer 1 without Built-In Erase command combines both the Buffer Write
and Buffer to Main Memory Program without Built-In Erase operations to allow any number of bytes (1 to 256/264 bytes)
to be programmed directly into previously erased locations in the main memory array. With the Main Memory Byte/Page
Program through Buffer 1 without Built-In Erase command, data is first clocked into Buffer 1, and then only the bytes
clocked into the buffer are programmed into the pre-erased byte locations in main memory. Multiple bytes up to the page
size can be entered with one command sequence.
To perform a Main Memory Byte/Page Program through Buffer 1 using the standard DataFlash page size (264 bytes), an
opcode of 02h must first be clocked into the device followed by three address bytes comprised of 3 dummy bits,
12 page address bits (PA11 - PA0) that specify the page in the main memory to be written, and 9 buffer address bits
(BFA8 - BFA0) that select the first byte in the buffer to be written. After all address bytes are clocked in, the device will
take data from the input pin (SI) and store it in Buffer 1. Any number of bytes (1 to 264) can be entered. If the end of the
buffer is reached, then the device will wrap around back to the beginning of the buffer.
To perform a Main Memory Byte/Page Program through Buffer 1 using the binary page size (256 bytes), an opcode of
02h for Buffer 1 using must first be clocked into the device followed by three address bytes comprised of 4 dummy bits,
12 page address bits (A19 - A8) that specify the page in the main memory to be written, and 8 buffer address bits (BFA7
- BFA0) that selects the first byte in the buffer to be written. After all address bytes are clocked in, the device will take
data from the input pin (SI) and store it in Buffer 1. Any number of bytes (1 to 256) can be entered. If the end of the buffer
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is reached, then the device will wrap around back to the beginning of the buffer. When using the binary page size, the
page and buffer address bits correspond to a 20-bit logical address (A19-A0) in the main memory.
After all data bytes have been clocked into the device, a low-to-high transition on the CS pin will start the program
operation in which the device will program the data stored in Buffer 1 into the main memory array. Only the data bytes
that were clocked into the device will be programmed into the main memory.
Example: If only two data bytes were clocked into the device, then only two bytes will be programmed into main
memory and the remaining bytes in the memory page will remain in their previous state.
The CS pin must be deasserted on a byte boundary (multiples of 8 bits); otherwise, the operation will be aborted and no
data will be programmed. The programming of the data bytes is internally self-timed and should take place in a maximum
time of tP (the program time will be a multiple of the tBP time depending on the number of bytes being programmed).
During this time, the RDY/BUSY bit in the Status Register will indicate that the device is busy.
The device also incorporates an intelligent programming algorithm that can detect when a byte location fails to program
properly. If a programming error arises, it will be indicated by the EPE bit in the Status Register.
6.6
Read-Modify-Write
A completely self-contained read-modify-write operation can be performed to reprogram any number of sequential bytes
in a page in the main memory array without affecting the rest of the bytes in the same page. This command allows the
device to easily emulate an EEPROM by providing a method to modify a single byte or more in the main memory in a
single operation, without the need for pre-erasing the memory or the need for any external RAM buffers. The
Read-Modify-Write command is essentially a combination of the Main Memory Page to Buffer Transfer, Buffer Write, and
Buffer to Main Memory Page Program with Built-in Erase commands.
To perform a Read-Modify-Write using the standard DataFlash page size (264 bytes), an opcode of 58h for Buffer 1 or
59h for Buffer 2 must be clocked into the device followed by three address bytes comprised of 3 dummy bits, 12 page
address bits (PA11 - PA0) that specify the page in the main memory to be written, and 9 byte address bits (BA8 - BA0)
that designate the starting byte address within the page to reprogram.
To perform a Read-Modify-Write using the binary page size (256 bytes), an opcode of 58h for Buffer 1 or 59h for Buffer 2
must be clocked into the device followed by three address bytes comprised of 4 dummy bits, 12 page address bits (A19 -
A8) that specify the page in the main memory to be written, and 8 byte address bits (A7 - A0) designate the starting byte
address within the page to reprogram.
After the address bytes have been clocked in, any number of sequential data bytes from one to 256/264 bytes can be
clocked into the device. If the end of the buffer is reached when clocking in the data, then the device will wrap around
back to the beginning of the buffer. After all data bytes have been clocked into the device, a low-to-high transition on the
CS pin will start the self-contained, internal read-modify-write operation. Only the data bytes that were clocked into the
device will be reprogrammed in the main memory.
Example: If only one data byte was clocked into the device, then only one byte in main memory will be reprogrammed
and the remaining bytes in the main memory page will remain in their previous state.
The CS pin must be deasserted on a byte boundary (multiples of 8 bits); otherwise, the operation will be aborted and no
data will be programmed. The reprogramming of the data bytes is internally self-timed and should take place in a
maximum time of tP. During this time, the RDY/BUSY bit in the Status Register will indicate that the device is busy.
The device also incorporates an intelligent erase and programming algorithm that can detect when a byte location fails to
erase or program properly. If an erase or program error arises, it will be indicated by the EPE bit in the Status Register.
Note:
The Read-Modify-Write command uses the same opcodes as the Auto Page Rewrite command. If no data
bytes are clocked into the device, then the device will perform an Auto Page Rewrite operation. See the
Auto Page Rewrite command description on page 27 for more details.
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6.7
Page Erase
The Page Erase command can be used to individually erase any page in the main memory array allowing the Buffer to
Main Memory Page Program without Built-In Erase command or the Main Memory Byte/Page Program through Buffer 1
command to be utilized at a later time.
To perform a Page Erase with the standard DataFlash page size (264 bytes), an opcode of 81h must be clocked into the
device followed by three address bytes comprised of 3 dummy bits, 12 page address bits (PA11 - PA0) that specify the
page in the main memory to be erased, and 9 dummy bits.
To perform a Page Erase with the binary page size (256 bytes), an opcode of 81h must be clocked into the device
followed by three address bytes comprised of 4 dummy bits, 12 page address bits (A19 - A8) that specify the page in the
main memory to be erased, and 8 dummy bits.
When a low-to-high transition occurs on the CS pin, the device will erase the selected page (the erased state is a
Logic 1). The erase operation is internally self-timed and should take place in a maximum time of tPE. During this time, the
RDY/BUSY bit in the Status Register will indicate that the device is busy.
The device also incorporates an intelligent erase algorithm that can detect when a byte location fails to erase properly. If
an erase error arises, it will be indicated by the EPE bit in the Status Register.
6.8
Block Erase
The Block Erase command can be used to erase a block of eight pages at one time. This command is useful when
needing to pre-erase larger amounts of memory and is more efficient than issuing eight separate Page Erase
commands.
To perform a Block Erase with the standard DataFlash page size (264 bytes), an opcode of 50h must be clocked into the
device followed by three address bytes comprised of 3 dummy bits, 9 page address bits (PA11 - PA3), and
12 dummy bits. The 9 page address bits are used to specify which block of eight pages is to be erased.
To perform a Block Erase with the binary page size (256 bytes), an opcode of 50h must be clocked into the device
followed by three address bytes comprised of 4 dummy bits, 9 page address bits (A19 - A11), and 11 dummy bits. The 9
page address bits are used to specify which block of eight pages is to be erased.
When a low-to-high transition occurs on the CS pin, the device will erase the selected block of eight pages. The erase
operation is internally self-timed and should take place in a maximum time of tBE. During this time, the RDY/BUSY bit in
the Status Register will indicate that the device is busy.
The device also incorporates an intelligent erase algorithm that can detect when a byte location fails to erase properly. If
an erase error arises, it will be indicated by the EPE bit in the Status Register.
Table 6-1. Block Erase Addressing
PA11/
A19
PA10/
A18
PA9/
A17
PA8/
A16
PA7/
A15
PA6/
A14
PA5/
A13
PA4/
A12
PA3/
A11
PA2/
A10
PA1/
A9
PA0/
A8
Block
0
0
0
0
•
0
0
0
0
•
0
0
0
0
•
0
0
0
0
•
0
0
0
0
•
0
0
0
0
•
0
0
0
0
•
0
0
1
1
•
0
1
0
1
•
X
X
X
X
•
X
X
X
X
•
X
X
X
X
•
0
1
2
3
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
X
X
X
X
X
X
X
X
X
X
X
X
508
509
510
511
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6.9
Sector Erase
The Sector Erase command can be used to individually erase any sector in the main memory.
The main memory array is comprised of nine sectors, and only one sector can be erased at a time. To perform an erase
of Sector 0a or Sector 0b with the standard DataFlash page size (264 bytes), an opcode of 7Ch must be clocked into the
device followed by three address bytes comprised of 3 dummy bits, 9 page address bits (PA11 - PA3), and
12 dummy bits. To perform a Sector 1-15 erase, an opcode of 7Ch must be clocked into the device followed by three
address bytes comprised of 3 dummy bits, 4 page address bits (PA11 - PA8), and 17 dummy bits.
To perform a Sector 0a or Sector 0b erase with the binary page size (256 bytes), an opcode of 7Ch must be clocked into
the device followed by three address bytes comprised of 4 dummy bits, 9 page address bits (A19 - A11), and
11 dummy bits. To perform a Sector 1-15 erase, an opcode of 7Ch must be clocked into the device followed by 4 dummy
bits, 4 page address bits (A19 - A16), and 16 dummy bits.
The page address bits are used to specify any valid address location within the sector to be erased. When a
low-to high transition occurs on the CS pin, the device will erase the selected sector. The erase operation is internally
self-timed and should take place in a maximum time of tSE. During this time, the RDY/BUSY bit in the Status Register will
indicate that the device is busy.
The device also incorporates an intelligent algorithm that can detect when a byte location fails to erase properly. If an
erase error arises, it will be indicated by the EPE bit in the Status Register.
Table 6-2. Sector Erase Addressing
PA11/ PA10/
PA9/
A17
PA8/
A16
PA7/
A15
PA6/
A14
PA5/
A13
PA4/
A12
PA3/
A11
PA2/
A10
PA1/
A9
PA0/
A8
A19
A18
Sector
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
1
X
X
X
X
X
X
X
X
X
X
X
X
0a
0b
1
0
0
0
0
X
X
X
X
X
X
X
X
X
X
0
0
2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
12
13
14
15
6.10 Chip Erase
The Chip Erase command allows the entire main memory array to be erased can be erased at one time.
To execute the Chip Erase command, a 4-byte command sequence of C7h, 94h, 80h, and 9Ah must be clocked into the
device. Since the entire memory array is to be erased, no address bytes need to be clocked into the device, and any data
clocked in after the opcode will be ignored. After the last bit of the opcode sequence has been clocked in, the CS pin
must be deasserted to start the erase process. The erase operation is internally self-timed and should take place in a
time of tCE. During this time, the RDY/BUSY bit in the Status Register will indicate that the device is busy.
The Chip Erase command will not affect sectors that are protected or locked down; the contents of those sectors will
remain unchanged. Only those sectors that are not protected or locked down will be erased.
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The WP pin can be asserted while the device is erasing, but protection will not be activated until the internal erase cycle
completes.
The device also incorporates an intelligent algorithm that can detect when a byte location fails to erase properly. If an
erase error arises, it will be indicated by the EPE bit in the Status Register.
Table 6-3. Chip Erase Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Chip Erase
C7h
94h
80h
9Ah
Figure 6-1. Chip Erase
CS
C7h
94h
80h
9Ah
Each transition represents eight bits
6.11 Program/Erase Suspend
In some code and data storage applications, it may not be possible for the system to wait the milliseconds required for
the Flash memory to complete a program or erase cycle. The Program/Erase Suspend command allows a program or
erase operation in progress to a particular 64KB sector of the main memory array to be suspended so that other device
operations can be performed.
Example: By suspending an erase operation to a particular sector, the system can perform functions such as a
program or read operation within a different 64KB sector. Other device operations, such as Read Status
Register, can also be performed while a program or erase operation is suspended.
To perform a Program/Erase Suspend, an opcode of B0h must be clocked into the device. No address bytes need to be
clocked into the device, and any data clocked in after the opcode will be ignored. When the CS pin is deasserted, the
program or erase operation currently in progress will be suspended within a time of tSUSP. One of the Program Suspend
bits (PS1 or PS2) or the Erase Suspend bit (ES) in the Status Register will then be set to the Logic 1 state. In addition,
the RDY/BUSY bit in the Status Register will indicate that the device is ready for another operation.
Read operations are not allowed to a 64KB sector that has had its program or erase operation suspended. If a read is
attempted to a suspended sector, then the device will output undefined data. Therefore, when performing a Continuous
Array Read operation and the device's internal address counter increments and crosses the sector boundary to a
suspended sector, the device will then start outputting undefined data continuously until the address counter increments
and crosses a sector boundary to an unsuspended sector.
A program operation is not allowed to a sector that has been erase suspended. If a program operation is attempted to an
erase suspended sector, then the program operation will abort.
During an Erase Suspend, a program operation to a different 64KB sector can be started and subsequently suspended.
This results in a simultaneous Erase Suspend/Program Suspend condition and will be indicated by the states of both the
ES and PS1 or PS2 bits in the Status Register being set to a Logic 1.
If a Reset command is performed, or if the RESET pin is asserted while a sector is erase suspended, then the suspend
operation will be aborted and the contents of the sector will be left in an undefined state. However, if a reset is performed
while a page is program or erase suspended, the suspend operation will abort but only the contents of the page that was
being programmed or erased will be undefined; the remaining pages in the 64KB sector will retain their previous
contents.
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Table 6-4. Operations Allowed and Not Allowed During Suspend
Operation During
Program Suspend in
Operation During
Program Suspend in
Buffer 2 (PS2)
Operation During
Command
Buffer 1 (PS1)
Erase Suspend (ES)
Read Commands
Read Array (All Opcodes)
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Read Buffer 1 (All Opcodes)
Read Buffer 2 (All Opcodes)
Program and Erase Commands
Buffer 1 Write
Not Allowed
Allowed
Allowed
Allowed
Buffer 2 Write
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Buffer 1 to Memory Program w/ Erase
Buffer 2 to Memory Program w/ Erase
Buffer 1 to Memory Program w/o Erase
Buffer 2 to Memory Program w/o Erase
Memory Program through Buffer 1 w/ Erase
Memory Program through Buffer 2 w/ Erase
Memory Program through Buffer 1 w/o Erase
Auto Page Rewrite through Buffer 1
Auto Page Rewrite through Buffer 2
Read-Modify-Write through Buffer 1
Read-Modify-Write through Buffer 2
Page Erase
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Allowed
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Block Erase
Sector Erase
Chip Erase
Protection and Security Commands
Enable Sector Protection
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Disable Sector Protection
Erase Sector Protection Register
Program Sector Protection Register
Read Sector Protection Register
Sector Lockdown
Not Allowed
Allowed
Not Allowed
Allowed
Not Allowed
Allowed
Read Sector Lockdown
Freeze Sector Lockdown State
Program Security Register
Read Security Register
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Allowed
Additional Commands
Main Memory to Buffer 1 Transfer
Main Memory to Buffer 2 Transfer
Main Memory to Buffer 1 Compare
Main Memory to Buffer 2 Compare
Enter Deep Power-Down
Not Allowed
Allowed
Allowed
Not Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Not Allowed
Not Allowed
Not Allowed
Allowed
Resume from Deep Power-Down
Enter Ultra-Deep Power-Down mode
Read Configuration Register
Read Status Register
Allowed
Allowed
Allowed
Read Manufacturer and Device ID
Reset (via Hardware or Software)
Allowed
Allowed
Allowed
Allowed
Allowed
Allowed
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6.12 Program/Erase Resume
The Program/Erase Resume command allows a suspended program or erase operation to be resumed and continue
where it left off.
To perform a Program/Erase Resume, an opcode of D0h must be clocked into the device. No address bytes need to be
clocked into the device, and any data clocked in after the opcode will be ignored. When the CS pin is deasserted, the
program or erase operation currently suspended will be resumed within a time of tRES. The PS1 bit, PS2 bit, or ES bit in
the Status Register will then be reset back to a Logic 0 state to indicate that the program or erase operation is no longer
suspended. In addition, the RDY/BUSY bit in the Status Register will indicate that the device is busy performing a
program or erase operation.
During a simultaneous Erase Suspend/Program Suspend condition, issuing the Program/Erase Resume command will
result in the program operation resuming first. After the program operation has been completed, the Program/Erase
Resume command must be issued again in order for the erase operation to be resumed.
While the device is busy resuming a program or erase operation, any attempts at issuing the Program/Erase Suspend
command will be ignored. Therefore, if a resumed program or erase operation needs to be subsequently suspended
again, the system must either wait the entire tRES time before issuing the Program/Erase Suspend command, or it must
check the status of the RDY/BUSY bit or the appropriate PS1, PS2, or ES bit in the Status Register to determine if the
previously suspended program or erase operation has resumed.
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7.
Sector Protection
Two protection methods, hardware and software controlled, are provided for protection against inadvertent or erroneous
program and erase cycles. The software controlled method relies on the use of software commands to enable and
disable sector protection while the hardware controlled method employs the use of the Write Protect (WP) pin. The
selection of which sectors that are to be protected or unprotected against program and erase operations is specified in
the Nonvolatile Sector Protection Register. The status of whether or not sector protection has been enabled or disabled
by either the software or the hardware controlled methods can be determined by checking the Status Register.
7.1
Software Sector Protection
Software controlled protection is useful in applications in which the WP pin is not or cannot be controlled by a host
processor. In such instances, the WP pin may be left floating (the WP pin is internally pulled high) and sector protection
can be controlled using the Enable Sector Protection and Disable Sector Protection commands.
If the device is power cycled, then the software controlled protection will be disabled. Once the device is powered up, the
Enable Sector Protection command should be reissued if sector protection is desired and if the WP pin is not used.
7.1.1 Enable Sector Protection
Sectors specified for protection in the Sector Protection Register can be protected from program and erase operations by
issuing the Enable Sector Protection command. To enable the sector protection, a 4-byte command sequence of 3Dh,
2Ah, 7Fh, and A9h must be clocked into the device. After the last bit of the opcode sequence has been clocked in, the
CS pin must be deasserted to enable the Sector Protection.
Table 7-1. Enable Sector Protection Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Enable Sector Protection
3Dh
2Ah
7Fh
A9h
Figure 7-1. Enable Sector Protection
CS
3Dh
2Ah
7Fh
A9h
SI
Each transition represents eight bits
7.1.2 Disable Sector Protection
To disable the sector protection, a 4-byte command sequence of 3Dh, 2Ah, 7Fh, and 9Ah must be clocked into the
device. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to disable the
sector protection.
Table 7-2. Disable Sector Protection Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Disable Sector Protection
3Dh
2Ah
7Fh
9Ah
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Figure 7-2. Disable Sector Protection
CS
3Dh
2Ah
7Fh
9Ah
SI
Each transition represents eight bits
7.2
Hardware Controlled Protection
Sectors specified for protection in the Sector Protection Register and the Sector Protection Register itself can be
protected from program and erase operations by asserting the WP pin and keeping the pin in its asserted state. The
Sector Protection Register and any sector specified for protection cannot be erased or programmed as long as the WP
pin is asserted. In order to modify the Sector Protection Register, the WP pin must be deasserted. If the WP pin is
permanently connected to GND, then the contents of the Sector Protection Register cannot be changed. If the WP pin is
deasserted or permanently connected to VCC, then the contents of the Sector Protection Register can be modified.
The WP pin will override the software controlled protection method but only for protecting the sectors.
Example: If the sectors were not previously protected by the Enable Sector Protection command, then simply
asserting the WP pin would enable the sector protection within the maximum specified tWPE time. When the
WP pin is deasserted, however, the sector protection would no longer be enabled (after the maximum
specified tWPD time) as long as the Enable Sector Protection command was not issued while the WP pin was
asserted. If the Enable Sector Protection command was issued before or while the WP pin was asserted,
then simply deasserting the WP pin would not disable the sector protection. In this case, the Disable Sector
Protection command would need to be issued while the WP pin is deasserted to disable the sector
protection. The Disable Sector Protection command is also ignored whenever the WP pin is asserted.
A noise filter is incorporated to help protect against spurious noise that may inadvertently assert or deassert the WP pin.
Figures 7-3 and Table 7-3 detail the sector protection status for various scenarios of the WP pin, the Enable Sector
Protection command, and the Disable Sector Protection command.
Figure 7-3. WP Pin and Protection Status
1
2
3
WP
Table 7-3. WP Pin and Protection Status
Time
Sector
Protection
Status
Sector
Protection
Register
Disable Sector
Protection Command
Period
WP Pin
Enable Sector Protection Command
Command Not Issued Previously
X
Disabled
Disabled
Enabled
Enabled
Enabled
Disabled
Enabled
Read/Write
Read/Write
Read/Write
Read
1
2
3
High
—
Issue Command
Issue Command
—
Low
X
X
Command Issued During Period 1 or 2
Not Issued Yet
Issue Command
—
Read/Write
Read/Write
Read/Write
High
—
Issue Command
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7.3
Sector Protection Register
The nonvolatile Sector Protection Register specifies which sectors are to be protected or unprotected with either the
software or hardware controlled protection methods. The Sector Protection Register contains sixteen bytes of data, of
which byte locations zero through fifteen contain values that specify whether Sectors 0 through 15 will be protected or
unprotected. The Sector Protection Register is user modifiable and must be erased before it can be reprogrammed.
Table 7-4 illustrates the format of the Sector Protection Register.
Table 7-4. Sector Protection Register
Sector Number
Protected
0 (0a, 0b)
1 to 15
FFh
See Table 7-5
Unprotected
00h
Note: 1. The default values for bytes 0 through 7 are 00h when shipped from Adesto.
Table 7-5. Sector 0 (0a, 0b) Sector Protection Register Byte Value
Bit 7:6
Bit 5:4
Bit 3:2
Bit 1:0
Sector 0a
(Page 0-7)
Sector 0b
(Page 8-255)
Data
Value
N/A
XX
XX
XX
XX
N/A
XX
XX
XX
XX
Sectors 0a and 0b Unprotected
Protect Sector 0a
00
11
00
11
00
00
11
11
0xh
Cxh
3xh
Fxh
Protect Sector 0b
Protect Sectors 0a and 0b
Note: 1. x = Don’t care
7.3.1 Erase Sector Protection Register
In order to modify and change the values of the Sector Protection Register, it must first be erased using the Erase Sector
Protection Register command.
To erase the Sector Protection Register, a 4-byte command sequence of 3Dh, 2Ah, 7Fh, and CFh must be clocked into
the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be deasserted to initiate the
internally self-timed erase cycle. The erasing of the Sector Protection Register should take place in a maximum time of
tPE. During this time, the RDY/BUSY bit in the Status Register will indicate that the device is busy. If the device is
powered-down before the completion of the erase cycle, then the contents of the Sector Protection Register cannot be
guaranteed.
The Sector Protection Register can be erased with sector protection enabled or disabled. Since the erased state (FFh) of
each byte in the Sector Protection Register is used to indicate that a sector is specified for protection, leaving the sector
protection enabled during the erasing of the register allows the protection scheme to be more effective in the prevention
of accidental programming or erasing of the device. If for some reason an erroneous program or erase command is sent
to the device immediately after erasing the Sector Protection Register and before the register can be reprogrammed,
then the erroneous program or erase command will not be processed because all sectors would be protected.
Table 7-6. Erase Sector Protection Register Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Erase Sector Protection Register
3Dh
2Ah
7Fh
CFh
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Figure 7-4. Erase Sector Protection Register
CS
SI
3Dh
2Ah
7Fh
CFh
Each transition represents eight bits
7.3.2 Program Sector Protection Register
Once the Sector Protection Register has been erased, it can be reprogrammed using the Program Sector Protection
Register command.
To program the Sector Protection Register, a 4-byte command sequence of 3Dh, 2Ah, 7Fh, and FCh must be clocked
into the device followed by sixteen bytes of data corresponding to Sectors 0 through 15. After the last bit of the opcode
sequence and data have been clocked in, the CS pin must be deasserted to initiate the internally self-timed program
cycle. The programming of the Sector Protection Register should take place in a maximum time of tP. During this time,
the RDY/BUSY bit in the Status Register will indicate that the device is busy. If the device is powered-down before the
completion of the erase cycle, then the contents of the Sector Protection Register cannot be guaranteed.
If the proper number of data bytes is not clocked in before the CS pin is deasserted, then the protection status of the
sectors corresponding to the bytes not clocked in cannot be guaranteed.
Example: If only the first two bytes are clocked in instead of the complete sixteen bytes, then the protection status of
the last 14 sectors cannot be guaranteed. Furthermore, if more than sixteen bytes of data is clocked into the
device, then the data will wrap back around to the beginning of the register. For instance, if seventeen bytes
of data are clocked in, then the seventeenth byte will be stored at byte location 0 of the Sector Protection
Register.
The data bytes clocked into the Sector Protection Register need to be valid values (0xh, 3xh, Cxh, and Fxh for Sector 0a
or Sector 0b, and 00h or FFh for other sectors) in order for the protection to function correctly. If a non-valid value is
clocked into a byte location of the Sector Protection Register, then the protection status of the sector corresponding to
that byte location cannot be guaranteed.
Example: If a value of 17h is clocked into byte location 2 of the Sector Protection Register, then the protection status
of Sector 2 cannot be guaranteed.
The Sector Protection Register can be reprogrammed while the sector protection is enabled or disabled. Being able to
reprogram the Sector Protection Register with the sector protection enabled allows the user to temporarily disable the
sector protection to an individual sector rather than disabling sector protection completely.
The Program Sector Protection Register command utilizes Buffer 1 for processing. Therefore, the contents of Buffer 1
will be altered from its previous state when this command is issued.
Table 7-7. Program Sector Protection Register Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Program Sector Protection Register
3Dh
2Ah
7Fh
FCh
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Figure 7-5. Program Sector Protection Register
CS
Data Byte
n
Data Byte
n + 1
Data Byte
n + 15
3Dh
2Ah
7Fh
FCh
SI
Each transition represents eight bits
7.3.3 Read Sector Protection Register
To read the Sector Protection Register, an opcode of 32h and three dummy bytes must be clocked into the device. After
the last bit of the opcode and dummy bytes have been clocked in, any additional clock pulses on the SCK pin will result
in the Sector Protection Register contents being output on the SO pin. The first byte (byte location 0) corresponds to
Sector 0 (0a and 0b), the second byte corresponds to Sector 1, and the last byte (byte location 15) corresponds to
Sector 15. Once the last byte of the Sector Protection Register has been clocked out, any additional clock pulses will
result in undefined data being output on the SO pin. The CS pin must be deasserted to terminate the Read Sector
Protection Register operation and put the output into a high-impedance state.
Table 7-8. Read Sector Protection Register Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Read Sector Protection Register
32h
XXh
XXh
XXh
Note: 1. XX = Dummy byte
Figure 7-6. Read Sector Protection Register
CS
32h
XX
XX
XX
SI
Data
n
Data
n + 1
Data
n + 15
SO
Each transition represents eight bits
7.3.4 About the Sector Protection Register
The Sector Protection Register is subject to a limit of 10,000 erase/program cycles. Users are encouraged to carefully
evaluate the number of times the Sector Protection Register will be modified during the course of the application’s life
cycle. If the application requires that the Security Protection Register be modified more than the specified limit of 10,000
cycles because the application needs to temporarily unprotect individual sectors (sector protection remains enabled
while the Sector Protection Register is reprogrammed), then the application will need to limit this practice. Instead, a
combination of temporarily unprotecting individual sectors along with disabling sector protection completely will need to
be implemented by the application to ensure that the limit of 10,000 cycles is not exceeded.
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8.
Security Features
8.1
Sector Lockdown
The device incorporates a sector lockdown mechanism that allows each individual sector to be permanently locked so
that it becomes read-only (ROM). This is useful for applications that require the ability to permanently protect a number of
sectors against malicious attempts at altering program code or security information.
Warning:
Once a sector is locked down, it can never be erased or programmed, and it can never be unlocked.
To issue the sector lockdown command, a 4-byte command sequence of 3Dh, 2Ah, 7Fh, and 30h must be clocked into
the device followed by three address bytes specifying any address within the sector to be locked down. After the last
address bit has been clocked in, the CS pin must be deasserted to initiate the internally self-timed lockdown sequence.
The lockdown sequence should take place in a maximum time of tP. During this time, the RDY/BUSY bit in the Status
Register will indicate that the device is busy. If the device is powered-down before the completion of the lockdown
sequence, then the lockdown status of the sector cannot be guaranteed. In this case, it is recommended that the user
read the Sector Lockdown Register to determine the status of the appropriate sector lockdown bits or bytes and re-issue
the Sector Lockdown command if necessary.
Table 8-1. Sector Lockdown Command
Command
Byte 1
Byte 2
Byte 3
Byte 4
Sector Lockdown
3Dh
2Ah
7Fh
30h
Figure 8-1. Sector Lockdown
CS
Address
byte
Address
byte
Address
byte
SI
3Dh
2Ah
7Fh
30h
Each transition represents eight bits
8.1.1 Read Sector Lockdown Register
The nonvolatile Sector Lockdown Register specifies which sectors in the main memory are currently unlocked or have
been permanently locked down. The Sector Lockdown Register is a read-only register and contains sixteen bytes of data
which correspond to Sectors 0 through 15. To read the Sector Lockdown Register, an opcode of 35h must be clocked
into the device followed by three dummy bytes. After the last bit of the opcode and dummy bytes have been clocked in,
the data for the contents of the Sector Lockdown Register will be clocked out on the SO pin. The first byte (byte
location 0) corresponds to Sector 0 (0a and 0b), the second byte corresponds to Sector 1, and the last byte (byte location
15) corresponds to Sector 15. After the last byte of the Sector Lockdown Register has been read, additional pulses on
the SCK pin will result in undefined data being output on the SO pin.
Deasserting the CS pin will terminate the Read Sector Lockdown Register operation and put the SO pin into a
high-impedance state. Table 8-2 details the format the Sector Lockdown Register.
Table 8-2. Sector Lockdown Register
Sector Number
Locked
0 (0a, 0b)
1 to 15
FFh
See Table 8-3
Unlocked
00h
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Table 8-3. Sector 0 (0a and 0b) Sector Lockdown Register Byte Value
Bit 7:6
Bit 5:4
Bit 3:2
Bit 1:0
Data
Value
Sector 0a
(Page 0-7)
Sector 0b
(Page 8-255)
N/A
00
00
00
00
N/A
00
00
00
00
Sectors 0a and 0b Unlocked
Sector 0a Locked
00
11
00
11
00
00
11
11
00h
C0h
30h
F0h
Sector 0b Locked
Sectors 0a and 0b Locked
Table 8-4. Read Sector Lockdown Register Command
Command
Byte 1
35h
Byte 2
Byte 3
XXh
Byte 4
Read Sector Lockdown Register
XXh
XXh
Figure 8-2. Read Sector Lockdown Register
CS
32h
XX
XX
XX
SI
Data
Data
n + 1
Data
n + 15
SO
n
Each transition represents eight bits
8.1.2 Freeze Sector Lockdown
The Sector Lockdown command can be permanently disabled, and the current sector lockdown state can be
permanently frozen so that no additional sectors can be locked down aside from those already locked down. Any
attempts to issue the Sector Lockdown command after the Sector Lockdown State has been frozen will be ignored.
To issue the Freeze Sector Lockdown command, the CS pin must be asserted and the opcode sequence of 34h, 55h,
AAh, and 40h must be clocked into the device. Any additional data clocked into the device will be ignored. When the CS
pin is deasserted, the current sector lockdown state will be permanently frozen within a time of tLOCK. In addition, the SLE
bit in the Status Register will be permanently reset to a Logic 0 to indicate that the Sector Lockdown command is
permanently disabled.
Table 8-5. Freeze Sector Lockdown
Command
Byte 1
Byte 2
Byte 3
Byte 4
Freeze Sector Lockdown
34h
55h
AAh
40h
Figure 8-3. Freeze Sector Lockdown
CS
34h
55h
AAh
40h
SI
Each transition represents eight bits
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8.2
Security Register
The device contains a specialized Security Register that can be used for purposes such as unique device serialization or
locked key storage. The register is comprised of a total of 128 bytes that is divided into two portions. The first 64 bytes
(byte locations 0 through 63) of the Security Register are allocated as a One-Time Programmable space. Once these
64 bytes have been programmed, they cannot be erased or reprogrammed. The remaining 64 bytes of the register (byte
locations 64 through 127) are factory programmed by Adesto and will contain a unique value for each device. The factory
programmed data is fixed and cannot be changed.
Table 8-6. Security Register
Security Register Byte Number
0
1
· · ·
63
64
65
· · ·
127
Data Type
One-Time User Programmable
Factory Programmed by Adesto
8.2.1 Programming the Security Register
The user programmable portion of the Security Register does not need to be erased before it is programmed.
To program the Security Register, a 4-byte opcode sequence of 9Bh, 00h, 00h, and 00h must be clocked into the device.
After the last bit of the opcode sequence has been clocked into the device, the data for the contents of the 64-byte user
programmable portion of the Security Register must be clocked in.
After the last data byte has been clocked in, the CS pin must be deasserted to initiate the internally self-timed program
cycle. The programming of the Security Register should take place in a time of tP, during which time the RDY/BUSY bit in
the Status Register will indicate that the device is busy. If the device is powered-down during the program cycle, then the
contents of the 64-byte user programmable portion of the Security Register cannot be guaranteed.
If the full 64 bytes of data are not clocked in before the CS pin is deasserted, then the values of the byte locations not
clocked in cannot be guaranteed.
Example: If only the first two bytes are clocked in instead of the complete 64 bytes, then the remaining 62 bytes of the
user programmable portion of the Security Register cannot be guaranteed. Furthermore, if more than
64 bytes of data is clocked into the device, then the data will wrap back around to the beginning of the
register. For example, if 65 bytes of data are clocked in, then the 65th byte will be stored at byte location 0 of
the Security Register.
Warning:
The user programmable portion of the Security Register can only be programmed one time.
Therefore, it is not possible, for example, to only program the first two bytes of the register and then program
the remaining 62 bytes at a later time.
The Program Security Register command utilizes Buffer 1 for processing. Therefore, the contents of
Buffer 1 will be altered from its previous state when this command is issued.
Figure 8-4. Program Security Register
CS
Data
n
Data
n + 1
Data
SI
9Bh
00h
00h
00h
n + 63
Each transition represents eight bits
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8.2.2 Reading the Security Register
To read the Security Register, an opcode of 77h and three dummy bytes must be clocked into the device. After the last
dummy bit has been clocked in, the contents of the Security Register can be clocked out on the SO pin. After the last
byte of the Security Register has been read, additional pulses on the SCK pin will result in undefined data being output
on the SO pin.
Deasserting the CS pin will terminate the Read Security Register operation and put the SO pin into a high-impedance
state.
Figure 8-5. Read Security Register
CS
SI
77h
XX
XX
XX
Data
n
Data
n + 1
Data
n + x
SO
Each transition represents eight bits
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9.
Additional Commands
9.1
Main Memory Page to Buffer Transfer
A page of data can be transferred from the main memory to either Buffer 1 or Buffer 2. To transfer a page of data using
the standard DataFlash page size (264 bytes), an opcode of 53h for Buffer 1 or 55h for Buffer 2 must be clocked into the
device followed by three address bytes comprised of 3 dummy bits, 12 page address bits (PA11 - PA0) which specify the
page in main memory to be transferred, and 9 dummy bits. To transfer a page of data using the binary page size (256
bytes), an opcode of 53h for Buffer 1 and 55h for Buffer 2 must be clocked into the device followed by three address
bytes comprised of 4 dummy bits, 12 page address bits (A19 - A8) which specify the page in the main memory to be
transferred, and 8 dummy bits.
The CS pin must be low while toggling the SCK pin to load the opcode and the three address bytes from the input pin
(SI). The transfer of the page of data from the main memory to the buffer will begin when the CS pin transitions from a
low to a high state. During the page transfer time (tXFR), the RDY/BUSY bit in the Status Register can be read to
determine whether or not the transfer has been completed.
9.2
Main Memory Page to Buffer Compare
A page of data in main memory can be compared to the data in Buffer 1 or Buffer 2 as a method to ensure that data was
successfully programmed after a Buffer to Main Memory Page Program command. To compare a page of data with the
standard DataFlash page size (264 bytes), an opcode of 60h for Buffer 1 or 61h for Buffer 2 must be clocked into the
device followed by three address bytes comprised of 3 dummy bits, 12 page address bits (PA11 - PA0) which specify the
page in the main memory to be compared to the buffer, and 9 dummy bits. To compare a page of data with the binary
page size (256 bytes), an opcode of 60h for Buffer 1 or 61h for Buffer 2 must be clocked into the device followed by three
address bytes comprised of 4 dummy bits, 12 page address bits (A19 - A8) which specify the page in the main memory
to be compared to the buffer, and 8 dummy bits.
The CS pin must be low while toggling the SCK pin to load the opcode and the address bytes from the input pin (SI). On
the low-to-high transition of the CS pin, the data bytes in the selected Main Memory Page will be compared with the data
bytes in Buffer 1 or Buffer 2. During the compare time (tCOMP), the RDY/BUSY bit in the Status Register will indicate that
the part is busy. On completion of the compare operation, bit 6 of the Status Register will be updated with the result of the
compare.
9.3
Auto Page Rewrite
This command only needs to be used if the possibility exists that static (non-changing) data may be stored in a page or
pages of a sector and the other pages of the same sector are erased and programmed a large number of times.
Applications that modify data in a random fashion within a sector may fall into this category. To preserve data integrity of
a sector, each page within a sector must be updated/rewritten at least once within every 50,000 cumulative page
erase/program operations within that sector. The Auto Page Rewrite command provides a simple and efficient method to
“refresh” a page in the main memory array in a single operation.
The Auto Page Rewrite command is a combination of the Main Memory Page to Buffer Transfer and Buffer to Main
Memory Page Program with Built-In Erase commands. With the Auto Page Rewrite command, a page of data is first
transferred from the main memory to Buffer 1 or Buffer 2 and then the same data (from Buffer 1 or Buffer 2) is
programmed back into the same page of main memory, essentially “refreshing” the contents of that page. To start the
Auto Page Rewrite operation with the standard DataFlash page size (264 bytes), a 1-byte opcode, 58H for Buffer 1 or
59H for Buffer 2, must be clocked into the device followed by three address bytes comprised of 3 dummy bits, 12 page
address bits (PA11-PA0) that specify the page in main memory to be rewritten, and 9 dummy bits.
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To initiate an Auto Page Rewrite with the a binary page size (256 bytes), the opcode 58H for Buffer 1 or 59H for Buffer 2,
must be clocked into the device followed by three address bytes consisting of 4 dummy bits, 12 page address bits
(A19 - A8) that specify the page in the main memory that is to be rewritten, and 8 dummy bits. When a low-to-high
transition occurs on the CS pin, the part will first transfer data from the page in main memory to a buffer and then
program the data from the buffer back into same page of main memory. The operation is internally self-timed and should
take place in a maximum time of tEP. During this time, the RDY/BUSY Status Register will indicate that the part is busy.
If a sector is programmed or reprogrammed sequentially page by page and the possibility does not exist that there will be
a page or pages of static data, then the programming algorithm shown in Figure 26-1 on page 61 is recommended.
Otherwise, if there is a chance that there may be a page or pages of a sector that will contain static data, then the
programming algorithm shown in Figure 26-2 on page 62 is recommended.
Note:
The Auto Page Rewrite command uses the same opcodes as the Read-Modify-Write command. If data
bytes are clocked into the device, then the device will perform a Read-Modify-Write operation. See the
Read-Modify-Write command description on page 12 for more details.
9.4
Status Register Read
The 2-byte Status Register can be used to determine the device's ready/busy status, page size, a Main Memory Page to
Buffer Compare operation result, the sector protection status, Freeze Sector Lockdown status, erase/program error
status, Program/Erase Suspend status, and the device density. The Status Register can be read at any time, including
during an internally self-timed program or erase operation.
To read the Status Register, the CS pin must first be asserted and then the opcode D7h must be clocked into the device.
After the opcode has been clocked in, the device will begin outputting Status Register data on the SO pin during every
subsequent clock cycle. After the second byte of the Status Register has been clocked out, the sequence will repeat
itself, starting again with the first byte of the Status Register, as long as the CS pin remains asserted and the clock pin is
being pulsed. The data in the Status Register is constantly being updated, so each repeating sequence may output new
data. The RDY/BUSY status is available for both bytes of the Status Register and is updated for each byte.
Deasserting the CS pin will terminate the Status Register Read operation and put the SO pin into a high-impedance
state. The CS pin can be deasserted at any time and does not require that a full byte of data be read.
Table 9-1. Status Register Format – Byte 1
Type(1)
Description
Bit
Name
0
1
0
1
Device is busy with an internal operation.
7
RDY/BUSY Ready/Busy Status
R
Device is ready.
Main memory page data matches buffer data.
Main memory page data does not match buffer data.
6
5:2
1
COMP
Compare Result
R
R
R
DENSITY Density Code
1001 8-Mbit
0
1
0
1
Sector protection is disabled.
PROTECT Sector Protection Status
Sector protection is enabled.
Device is configured for standard DataFlash page size (264 bytes).
Device is configured for “power of 2” binary page size (256 bytes).
0
PAGE SIZE Page Size Configuration
R
Note: 1. R = Readable only
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Table 9-2. Status Register Format – Byte 2
Type(1)
Bit
7
Name
Description
Device is busy with an internal operation.
0
1
0
0
1
0
0
1
0
1
0
1
0
1
RDY/BUSY Ready/Busy Status
R
R
R
R
R
Device is ready.
6
RES
EPE
RES
SLE
Reserved for Future Use
Erase/Program Error
Reserved for future use.
Erase or program operation was successful.
Erase or program error detected.
5
4
Reserved for Future Use
Sector Lockdown Enabled
Reserved for future use.
Sector Lockdown command is disabled.
Sector Lockdown command is enabled.
No program operation has been suspended while using Buffer 2.
A sector is program suspended while using Buffer 2.
No program operation has been suspended while using Buffer 1.
A sector is program suspended while using Buffer 1.
No sectors are erase suspended.
3
Program Suspend Status
(Buffer 2)
2
1
0
PS2
PS1
ES
R
R
R
Program Suspend Status
(Buffer 1)
Erase Suspend
A sector is erase suspended.
Note: 1. R = Readable only
9.4.1 RDY/BUSY Bit
The RDY/BUSY bit is used to determine whether or not an internal operation, such as a program or erase, is in progress.
To poll the RDY/BUSY bit to detect the completion of an internally timed operation, new Status Register data must be
continually clocked out of the device until the state of the RDY/BUSY bit changes from a Logic 0 to a Logic 1.
9.4.2 COMP Bit
The result of the most recent Main Memory Page to Buffer Compare operation is indicated using the COMP bit. If the
COMP bit is a Logic 1, then at least one bit of the data in the Main Memory Page does not match the data in the buffer.
9.4.3 DENSITY Bits
The device density is indicated using the DENSITY bits. For the AT45DB081E, the four bit binary value is 1001. The
decimal value of these four binary bits does not actually equate to the device density; the four bits represent a
combinational code relating to differing densities of DataFlash devices. The DENSITY bits are not the same as the
density code indicated in the JEDEC Device ID information. The DENSITY bits are provided only for backward
compatibility to older generation DataFlash devices.
9.4.4 PROTECT Bit
The PROTECT bit provides information to the user on whether or not the sector protection has been enabled or disabled,
either by the software-controlled method or the hardware-controlled method.
9.4.5 PAGE SIZE Bit
The PAGE SIZE bit indicates whether the buffer size and the page size of the main memory array is configured for the
“power of 2” binary page size (256 bytes) or the standard DataFlash page size (264 bytes).
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9.4.6 EPE Bit
The EPE bit indicates whether the last erase or program operation completed successfully or not. If at least one byte
during the erase or program operation did not erase or program properly, then the EPE bit will be set to the Logic 1 state.
The EPE bit will not be set if an erase or program operation aborts for any reason, such as an attempt to erase or
program a protected region or a locked down sector or an attempt to erase or program a suspended sector. The EPE bit
is updated after every erase and program operation.
9.4.7 SLE Bit
The SLE bit indicates whether or not the Sector Lockdown command is enabled or disabled. If the SLE bit is a Logic 1,
then the Sector Lockdown command is still enabled and sectors can be locked down. If the SLE bit is a Logic 0, then the
Sector Lockdown command has been disabled and no further sectors can be locked down.
9.4.8 PS2 Bit
The PS2 bit indicates if a program operation has been suspended while using Buffer 2. If the PS2 bit is a Logic 1, then a
program operation has been suspended while Buffer 2 was being used, and any command attempts that would modify
the contents of Buffer 2 will be ignored.
9.4.9 PS1 Bit
The PS1 bit indicates if a program operation has been suspended while using Buffer 1. If the PS1 bit is a Logic 1, then a
program operation has been suspended while Buffer 1 was being used, and any command attempts that would modify
the contents of Buffer 1 will be ignored.
9.4.10 The ES bit
The ES bit indicates whether or not an erase has been suspended. If the ES bit is a Logic 1, then an erase operation
(page, block, sector, or chip) has been suspended.
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10. Deep Power-Down
During normal operation, the device will be placed in the standby mode to consume less power as long as the CS pin
remains deasserted and no internal operation is in progress. The Deep Power-Down command offers the ability to place
the device into an even lower power consumption state called the Deep Power-Down mode.
When the device is in the Deep Power-Down mode, all commands including the Status Register Read command will be
ignored with the exception of the Resume from Deep Power-Down command. Since all commands will be ignored, the
mode can be used as an extra protection mechanism against program and erase operations.
Entering the Deep Power-Down mode is accomplished by simply asserting the CS pin, clocking in the opcode B9h, and
then deasserting the CS pin. Any additional data clocked into the device after the opcode will be ignored. When the CS
pin is deasserted, the device will enter the Deep Power-Down mode within the maximum time of tEDPD
.
The complete opcode must be clocked in before the CS pin is deasserted, and the CS pin must be deasserted on an
even byte boundary (multiples of 8 bits); otherwise, the device will abort the operation and return to the standby mode
once the CS pin is deasserted. In addition, the device will default to the standby mode after a power cycle.
The Deep Power-Down command will be ignored if an internally self-timed operation such as a program or erase cycle is
in progress. The Deep Power-Down command must be reissued after the internally self-timed operation has been
completed in order for the device to enter the Deep Power-Down mode.
Figure 10-1. Deep Power-Down
CS
tEDPD
0
1
2
3
4
5
6
7
SCK
SI
Opcode
1
MSB
0
1
1
1
0
0
1
High-impedance
Active Current
SO
I
CC
Standby Mode Current
Deep Power-Down Mode Current
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10.1 Resume from Deep Power-Down
In order to exit the Deep Power-Down mode and resume normal device operation, the Resume from Deep Power-Down
command must be issued. The Resume from Deep Power-Down command is the only command that the device will
recognize while in the Deep Power-Down mode.
To resume from the Deep Power-Down mode, the CS pin must first be asserted and then the opcode ABh must be
clocked into the device. Any additional data clocked into the device after the opcode will be ignored. When the CS pin is
deasserted, the device will exit the Deep Power-Down mode and return to the standby mode within the maximum time of
tRDPD. After the device has returned to the standby mode, normal command operations such as Continuous Array Read
can be resumed.
If the complete opcode is not clocked in before the CS pin is deasserted, or if the CS pin is not deasserted on an even
byte boundary (multiples of 8 bits), then the device will abort the operation and return to the Deep Power-Down mode.
Figure 10-2. Resume from Deep Power-Down
CS
tRDPD
0
1
2
3
4
5
6
7
SCK
SI
Opcode
1
MSB
0
1
0
1
0
1
1
High-impedance
Active Current
SO
I
CC
Standby Mode Current
Deep Power-Down Mode Current
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10.2 Ultra-Deep Power-Down
The Ultra-Deep Power-Down mode allows the device to consume far less power compared to the standby and Deep
Power-Down modes by shutting down additional internal circuitry. Since almost all active circuitry is shutdown in this
mode to conserve power, the contents of the SRAM buffers cannot be maintained. Therefore, any data stored in the
SRAM buffers will be lost once the device enters the Ultra-Deep Power-Down mode.
When the device is in the Ultra-Deep Power-Down mode, all commands including the Status Register Read and Resume
from Deep Power-Down commands will be ignored. Since all commands will be ignored, the mode can be used as an
extra protection mechanism against program and erase operations.
Entering the Ultra-Deep Power-Down mode is accomplished by simply asserting the CS pin, clocking in the opcode 79h,
and then deasserting the CS pin. Any additional data clocked into the device after the opcode will be ignored. When the
CS pin is deasserted, the device will enter the Ultra-Deep Power-Down mode within the maximum time of tEUDPD
.
The complete opcode must be clocked in before the CS pin is deasserted, and the CS pin must be deasserted on an
even byte boundary (multiples of 8 bits); otherwise, the device will abort the operation and return to the standby mode
once the CS pin is deasserted. In addition, the device will default to the standby mode after a power cycle.
The Ultra-Deep Power-Down command will be ignored if an internally self-timed operation such as a program or erase
cycle is in progress. The Ultra-Deep Power-Down command must be reissued after the internally self-timed operation
has been completed in order for the device to enter the Ultra-Deep Power-Down mode.
Figure 10-3. Ultra-Deep Power-Down
CS
tEUDPD
0
1
2
3
4
5
6
7
SCK
SI
Opcode
0
MSB
1
1
1
1
0
0
1
High-impedance
Active Current
SO
I
CC
Standby Mode Current
Ultra-Deep Power-Down Mode Current
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10.2.1 Exit Ultra-Deep Power-Down
To exit from the Ultra-Deep Power-Down mode, the CS pin must simply be pulsed by asserting the CS pin, waiting the
minimum necessary tCSLU time, and then deasserting the CS pin again. To facilitate simple software development, a
dummy byte opcode can also be entered while the CS pin is being pulsed just as in a normal operation like the Program
Suspend operation; the dummy byte opcode is simply ignored by the device in this case. After the CS pin has been
deasserted, the device will exit from the Ultra-Deep Power-Down mode and return to the standby mode within a
maximum time of tXUDPD. If the CS pin is reasserted before the tXUDPD time has elapsed in an attempt to start a new
operation, then that operation will be ignored and nothing will be performed. The system must wait for the device to return
to the standby mode before normal command operations such as Continuous Array Read can be resumed.
Since the contents of the SRAM buffers cannot be maintained while in the Ultra-Deep Power-Down mode, the SRAM
buffers will contain undefined data when the device returns to the standby mode.
Figure 10-4. Exit Ultra-Deep Power-Down
CS
t
CSLU
tXUDPD
High-impedance
SO
Active Current
I
CC
Standby Mode Current
Ultra-Deep Power-Down Mode Current
Chip Select Low
By asserting the CS pin, waiting the minimum necessary tXUDPD time, and then clocking in the first bit of the next
Opcode command cycle. If the first bit of the next command is clocked in before the tXUDPD time has elapsed, the
device will exit Ultra Deep Power Down, however the intended operation will be ignored.
Figure 10-5. Exit Ultra-Deep Power-Down (Chip Select Low)
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11. Buffer and Page Size Configuration
The memory array of DataFlash devices is actually larger than other Serial Flash devices in that extra user-accessible
bytes are provided in each page of the memory array. For the AT45DB081E, there are an extra eight bytes of memory in
each page for a total of an extra 32KB (256-Kbits) of user-accessible memory.
Some applications, however, may not want to take advantage of this extra memory and instead architect their software to
operate on a “power of 2” binary, logical addressing scheme. To allow this, the DataFlash can be configured so that the
buffer and page sizes are 256 bytes instead of the standard 264 bytes. In addition, the configuration of the buffer and
page sizes is reversible and can be changed from 264 bytes to 256 bytes or from 256 bytes to 264 bytes. The configured
setting is stored in an internal nonvolatile register so that the buffer and page size configuration is not affected by power
cycles. The nonvolatile register has a limit of 10,000 erase/program cycles; therefore, care should be taken to not switch
between the size options more than 10,000 times.
Devices are initially shipped from Adesto with the buffer and page sizes set to 264 bytes. Devices can be ordered from
Adesto pre-configured for the “power of 2” binary size of 256 bytes. For details, see Section 27., Ordering Information
(Standard DataFlash Page Size) on page 63.
To configure the device for “power of 2” binary page size (256 bytes), a 4-byte opcode sequence of 3Dh, 2Ah, 80h, and
A6h must be clocked into the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be
deasserted to initiate the internally self-timed configuration process and nonvolatile register program cycle. The
programming of the nonvolatile register should take place in a time of tEP, during which time the RDY/BUSY bit in the
Status Register will indicate that the device is busy. The device does not need to be power cycled after the completion of
the configuration process and register program cycle in order for the buffer and page size to be configured to 256 bytes.
To configure the device for standard DataFlash page size (264 bytes), a 4-byte opcode sequence of 3Dh, 2Ah, 80h, and
A7h must be clocked into the device. After the last bit of the opcode sequence has been clocked in, the CS pin must be
deasserted to initiate the internally self-timed configuration process and nonvolatile register program cycle. The
programming of the nonvolatile register should take place in a time of tEP, during which time the RDY/BUSY bit in the
Status Register will indicate that the device is busy. The device does not need to be power cycled after the completion of
the configuration process and register program cycle in order for the buffer and page size to be configured to 264 bytes.
Table 11-1. Buffer and Page Size Configuration Commands
Command
Byte 1
3Dh
Byte 2
2Ah
Byte 3
80h
Byte 4
A6h
“Power of 2” binary page size (256 bytes)
DataFlash page size (264 bytes)
3Dh
2Ah
80h
A7h
Figure 11-1. Buffer and Page Size Configuration
CS
Opcode
Byte 4
3Dh
2Ah
80h
SI
Each transition represents eight bits
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12. Manufacturer and Device ID Read
Identification information can be read from the device to enable systems to electronically query and identify the device
while it is in the system. The identification method and the command opcode comply with the JEDEC Standard for
“Manufacturer and Device ID Read Methodology for SPI Compatible Serial Interface Memory Devices”. The type of
information that can be read from the device includes the JEDEC-defined Manufacturer ID, the vendor-specific
Device ID, and the vendor-specific Extended Device Information.
The Read Manufacturer and Device ID command is limited to a maximum clock frequency of fCLK. Since not all Flash
devices are capable of operating at very high clock frequencies, applications should be designed to read the
identification information from the devices at a reasonably low clock frequency to ensure that all devices to be used in the
application can be identified properly. Once the identification process is complete, the application can then increase the
clock frequency to accommodate specific Flash devices that are capable of operating at the higher clock frequencies.
To read the identification information, the CS pin must first be asserted and then the opcode 9Fh must be clocked into
the device. After the opcode has been clocked in, the device will begin outputting the identification data on the SO pin
during the subsequent clock cycles. The first byte to be output will be the Manufacturer ID, followed by two bytes of the
Device ID information. The fourth byte output will be the Extended Device Information (EDI) String Length, which will be
01h indicating that one byte of EDI data follows. After the one byte of EDI data is output, the SO pin will go into a
high-impedance state; therefore, additional clock cycles will have no affect on the SO pin and no data will be output. As
indicated in the JEDEC Standard, reading the EDI String Length and any subsequent data is optional.
Deasserting the CS pin will terminate the Manufacturer and Device ID Read operation and put the SO pin into a
high-impedance state. The CS pin can be deasserted at any time and does not require that a full byte of data be read.
Table 12-1. Manufacturer and Device ID Information
Byte No.
Data Type
Value
1Fh
25h
00h
01h
00h
1
2
3
4
5
Manufacturer ID
Device ID (Byte 1)
Device ID (Byte 2)
[Optional to Read] Extended Device Information (EDI) String Length
[Optional to Read] EDI Byte 1
Table 12-2. Manufacturer and Device ID Details
Hex
Data Type
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value Details
JEDEC Assigned Code
Manufacturer ID
1Fh
25h
00h
JEDEC code:
0001 1111 (1Fh for Adesto)
0
0
0
0
0
1
0
1
0
0
1
1
1
0
1
1
0
Family Code
Density Code
1
Family code:
Density code:
001 (AT45Dxxx Family)
00101 (8-Mbit)
Device ID (Byte 1)
Device ID (Byte 2)
0
Sub Code
0
0
Product Variant
Sub code:
Product variant: 00000
000 (Standard Series)
0
0
0
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Table 12-3. EDI Data
Hex
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value Details
Byte Number
RFU
0
Device Revision
RFU:
Reserved for Future Use
1
00h
Device revision: 00000 (Initial Version)
0
0
0
0
0
0
0
Figure 12-1. Read Manufacturer and Device ID
CS
0
6
7
8
14 15 16
22 23 24
30 31 32
38 39 40
46
SCK
SI
Opcode
9Fh
High-impedance
1Fh
25h
00h
01h
EDI
00h
EDI
SO
Manufacturer ID
Device ID
Byte 1
Device ID
Byte 2
String Length
Data Byte 1
Note: Each transition
shown for SI and SO represents one byte (8 bits)
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13. Software Reset
In some applications, it may be necessary to prematurely terminate a program or erase cycle early rather than wait the
hundreds of microseconds or milliseconds necessary for the program or erase operation to complete normally. The
Software Reset command allows a program or erase operation in progress to be ended abruptly and returns the device
to an idle state.
To perform a Software Reset, the CS pin must be asserted and a 4-byte command sequence of F0h, 00h, 00h, and 00h
must be clocked into the device. Any additional data clocked into the device after the last byte will be ignored. When the
CS pin is deasserted, the program or erase operation currently in progress will be terminated within a time tSWRST. Since
the program or erase operation may not complete before the device is reset, the contents of the page being programmed
or erased cannot be guaranteed to be valid.
The Software Reset command has no effect on the states of the Sector Protection Register, the Sector Lockdown
Register, or the buffer and page size configuration. The PS2, PS1, and ES bits of the Status Register, however, will be
reset back to their default states. If a Software Reset operation is performed while a sector is erase suspended, the
suspend operation will abort and the contents of the page or block being erased in the suspended sector will be left in an
undefined state. If a Software Reset is performed while a sector is program suspended, the suspend operation will abort
and the contents of the page that was being programmed and subsequently suspended will be undefined. The remaining
pages in the sector will retain their previous contents.
The complete 4-byte opcode must be clocked into the device before the CS pin is deasserted, and the CS pin must be
deasserted on a byte boundary (multiples of 8 bits); otherwise, no reset operation will be performed.
Table 13-1. Software Reset
Command
Byte 1
Byte 2
Byte 3
Byte 4
Software Reset
F0h
00h
00h
00h
Figure 13-1. Software Reset
CS
F0h
00h
00h
00h
SI
Each transition represents eight bits
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14. Operation Mode Summary
The commands described previously can be grouped into four different categories to better describe which commands
can be executed at what times.
Group A commands consist of:
1. Main Memory Page Read
2. Continuous Array Read (SPI)
3. Read Sector Protection Register
4. Read Sector Lockdown Register
5. Read Security Register
6. Buffer 1 (or 2) Read
Group B commands consist of:
1. Page Erase
2. Block Erase
3. Sector Erase
4. Chip Erase
5. Main Memory Page to Buffer 1 (or 2) Transfer
6. Main Memory Page to Buffer 1 (or 2) Compare
7. Buffer 1 (or 2) to Main Memory Page Program with Built-In Erase
8. Buffer 1 (or 2) to Main Memory Page Program without Built-In Erase
9. Main Memory Page Program through Buffer 1 (or 2) with Built-In Erase
10. Main Memory Byte/Page Program through Buffer 1 without Built-In Erase
11. Auto Page Rewrite
12. Read-Modify-Write
Group C commands consist of:
1. Buffer 1 (or 2) Write
2. Status Register Read
3. Manufacturer and Device ID Read
Group D commands consist of:
1. Erase Sector Protection Register
2. Program Sector Protection Register
3. Sector Lockdown
4. Program Security Register
5. Buffer and Page Size Configuration
6. Freeze Sector Lockdown
If a Group A command is in progress (not fully completed), then another command in Group A, B, C, or D should not be
started. However, during the internally self-timed portion of Group B commands, any command in Group C can be
executed. The Group B commands using Buffer 1 should use Group C commands using Buffer 2 and vice versa. Finally,
during the internally self-timed portion of a Group D command, only the Status Register Read command should be
executed.
Most of the commands in Group B can be suspended and resumed, except the Buffer Transfer, Buffer Compare, Auto
Page Rewrite and Read-Modify-Write operations. If a Group B command is suspended, all of the Group A commands
can be executed. See Table 6-4 to determine which of the Group B, Group C, and Group D commands are allowed.
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15. Command Tables
Table 15-1. Read Commands
Command
Opcode
D2h
01h
Main Memory Page Read
Continuous Array Read (Low Power Mode)
Continuous Array Read (Low Frequency)
Continuous Array Read (High Frequency)
Continuous Array Read (High Frequency)
Continuous Array Read (Legacy Command – Not Recommended for New Designs)
Buffer 1 Read (Low Frequency)
03h
0Bh
1Bh
E8h
D1h
D3h
D4h
D6h
Buffer 2 Read (Low Frequency)
Buffer 1 Read (High Frequency)
Buffer 2 Read (High Frequency)
Table 15-2. Program and Erase Commands
Command
Opcode
Buffer 1 Write
84h
Buffer 2 Write
87h
Buffer 1 to Main Memory Page Program with Built-In Erase
Buffer 2 to Main Memory Page Program with Built-In Erase
Buffer 1 to Main Memory Page Program without Built-In Erase
Buffer 2 to Main Memory Page Program without Built-In Erase
Main Memory Page Program through Buffer 1 with Built-In Erase
Main Memory Page Program through Buffer 2 with Built-In Erase
Main Memory Byte/Page Program through Buffer 1 without Built-In Erase
Page Erase
83h
86h
88h
89h
82h
85h
02h
81h
Block Erase
50h
Sector Erase
7Ch
Chip Erase
C7h + 94h + 80h + 9Ah
Program/Erase Suspend
B0h
D0h
58h
59h
Program/Erase Resume
Read-Modify-Write through Buffer 1
Read-Modify-Write through Buffer 2
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Table 15-3. Protection and Security Commands
Command
Opcode
3Dh + 2Ah + 7Fh + A9h
3Dh + 2Ah + 7Fh + 9Ah
3Dh + 2Ah + 7Fh + CFh
3Dh + 2Ah + 7Fh + FCh
32h
Enable Sector Protection
Disable Sector Protection
Erase Sector Protection Register
Program Sector Protection Register
Read Sector Protection Register
Sector Lockdown
3Dh + 2Ah + 7Fh + 30h
35h
Read Sector Lockdown Register
Freeze Sector Lockdown
Program Security Register
Read Security Register
34h + 55h + AAh + 40h
9Bh + 00h + 00h + 00h
77h
Table 15-4. Additional Commands
Command
Opcode
Main Memory Page to Buffer 1 Transfer
Main Memory Page to Buffer 2 Transfer
Main Memory Page to Buffer 1 Compare
Main Memory Page to Buffer 2 Compare
Auto Page Rewrite or Read-Modify-Write through Buffer 1
Auto Page Rewrite or Read-Modify-Write through Buffer 2
Deep Power-Down
53h
55h
60h
61h
58h
59h
B9h
Resume from Deep Power-Down
Ultra-Deep Power-Down
ABh
79h
Status Register Read
D7h
Manufacturer and Device ID Read
Configure “Power of 2” (Binary) Page Size
Configure Standard DataFlash Page Size
Software Reset
9Fh
3Dh + 2Ah + 80h + A6h
3Dh + 2Ah + 80h + A7h
F0h + 00h + 00h + 00h
Table 15-5. Legacy Commands(1)
Command
Opcode
54H
Buffer 1 Read
Buffer 2 Read
56H
Main Memory Page Read
Continuous Array Read
Status Register Read
52H
68H
57H
Note: 1. Legacy commands are not recommended for new designs.
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Table 15-6. Detailed Bit-level Addressing Sequence for Binary Page Size (256 bytes)
Page Size = 256 bytes Address Byte Address Byte
Address Byte
Additional
Dummy
Bytes
Opcode
Opcode
N/A
N/A
N/A
1
01h
02h
03h
0Bh
1Bh
32h
35h
50h
53h
55h
58h(1)
59h(1)
58h(2)
59h(2)
60h
61h
77h
79h
7Ch
81h
82h
83h
84h
85h
86h
87h
88h
89h
9Fh
B9h
ABh
B0h
D0h
D1h
D2h
D3h
D4h
D6h
D7h
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
1
1
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
0
0
0
0
0
0
0
0
0
1
1
0
1
1
1
1
1
1
1
1
0
0
0
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
1
0
1
0
0
0
1
1
1
1
0
0
1
0
0
0
0
0
0
0
1
1
1
0
1
1
1
1
1
0
0
1
0
0
0
0
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
0
0
1
1
0
1
1
1
0
1
1
1
0
1
0
1
1
0
1
0
1
0
1
1
1
0
1
0
1
0
1
0
1
0
1
1
1
1
0
0
1
0
1
0
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
A
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
X
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
X
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
X
A
A
A
A
A
A
A
A
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
A
A
A
A
A
X
X
X
X
X
X
X
A
A
X
X
X
2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4
N/A
N/A
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
A
A
A
A
X
A
A
X
A
A
A
A
A
A
X
A
A
X
A
A
A
A
A
A
X
A
A
X
A
A
A
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
A
A
A
X
A
A
X
A
A
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
X
X
A
X
A
A
X
A
X
X
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
X
A
X
X
X
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
X
X
X
X
A
X
X
X
A
A
A
A
N/A
1
1
N/A
N/A
N/A
N/A
Note: 1. Shown to indicate when the Auto Page Rewrite operation is executed.
2. Shown to indicate when the Read-Modify-Write operation is executed.
3. X = Dummy Bit
AT45DB081E [PRELIMINARY DATASHEET]
42
DS-45DB081E-028C–DFLASH–10/2013
Table 15-7. Detailed Bit-level Addressing Sequence for Standard DataFlash Page Size (264 bytes)
Page Size = 264 bytes Address Byte Address Byte Address Byte
Additional
Dummy
Bytes
Opcode
Opcode
01h
02h
03h
0Bh
1Bh
32h
35h
50h
53h
55h
58h(1)
59h(1)
58h(2)
59h(2)
60h
61h
77h
79h
7Ch
81h
82h
83h
84h
85h
86h
87h
88h
89h
9Fh
B9h
ABh
B0h
D0h
D1h
D2h
D3h
D4h
D6h
D7h
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
0
0
0
0
1
1
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
0
0
0
0
0
0
0
0
0
1
1
0
1
1
1
1
1
1
1
1
0
0
0
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
1
0
1
0
0
0
1
1
1
1
0
0
1
0
0
0
0
0
0
0
1
1
1
0
1
1
1
1
1
0
0
1
0
0
0
0
0
0
0
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
0
0
1
0
0
1
1
1
0
1
1
1
0
1
0
1
1
0
1
0
1
0
1
1
1
0
1
0
1
0
1
0
1
0
1
1
1
1
0
0
1
0
1
0
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
P
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
X
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
X
P
P
P
P
P
P
P
P
X
P
P
P
P
P
X
X
X
P
P
P
P
P
P
P
P
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
B
B
B
B
B
X
X
X
X
X
X
X
B
B
X
X
X
N/A
N/A
N/A
1
2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4
N/A
N/A
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
P
P
P
P
X
P
P
X
P
P
P
P
P
P
X
P
P
X
P
P
P
P
P
P
X
P
P
X
P
P
P
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
P
P
P
X
P
P
X
P
P
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
X
X
B
X
B
B
X
B
X
X
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
P
X
X
X
X
P
X
X
X
X
P
X
X
X
X
P
X
X
X
X
P
X
X
X
X
P
X
X
X
X
P
X
X
X
X
X
P
X
X
X
X
P
X
X
X
X
P
X
X
X
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
P
X
X
X
P
X
X
X
B
B
B
B
N/A
1
1
N/A
N/A
N/A
N/A
Notes: 1. Shown to indicate when the Auto Page Rewrite operation is executed.
2. Shown to indicate when the Read-Modify-Write operation is executed.
3. P = Page Address Bit, B = Byte/Buffer Address Bit, X = Dummy Bit
AT45DB081E [PRELIMINARY DATASHEET]
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DS-45DB081E-028C–DFLASH–10/2013
16. Power-On/Reset State
When power is first applied to the device, or when recovering from a reset condition, the device will default to SPI
Mode 3. In addition, the output pin (SO) will be in a high impedance state, and a high-to-low transition on the CS pin will
be required to start a valid instruction. The SPI mode (Mode 3 or Mode 0) will be automatically selected on every falling
edge of CS by sampling the inactive clock state.
16.1 Initial Power-Up Timing Restrictions
During power-up, the device must not be accessed for at least the minimum tVCSL time after the supply voltage reaches
the minimum VCC level. While the device is being powered-up, the internal Power-On Reset (POR) circuitry keeps the
device in a reset mode until the supply voltage rises above the maximum POR threshold value (VPOR). During this time,
all operations are disabled and the device will not respond to any commands. After power-up, the device will be in the
standby mode.
If the first operation to the device after power-up will be a program or erase operation, then the operation cannot be
started until the supply voltage reaches the minimum VCC level and an internal device delay has elapsed. This delay will
be a maximum time of tPUW
.
Table 16-1. Power-Up Timing
Symbol
tVCSL
Parameter
Min
Max
Units
μs
Minimum VCC to Chip Select Low Time
Power-Up Device Delay Before Program or Erase Allowed
Power-On Reset (POR) Voltage
70
tPUW
3
ms
V
VPOR
1.45
1.6
Figure 16-1. Power-Up Timing
VCC
Read Operation Permitted
V
(min)
(max)
(min)
CC
tVCSL
tPUW
V
POR
Do Not Attempt
Device Access
During this Time
Program/Erase Operations Permitted
V
POR
Time
AT45DB081E [PRELIMINARY DATASHEET]
44
DS-45DB081E-028C–DFLASH–10/2013
17. System Considerations
The serial interface is controlled by the Serial Clock (SCK), Serial Input (SI), and Chip Select (CS) pins. These signals
must rise and fall monotonically and be free from noise. Excessive noise or ringing on these pins can be misinterpreted
as multiple edges and cause improper operation of the device. PCB traces must be kept to a minimum distance or
appropriately terminated to ensure proper operation. If necessary, decoupling capacitors can be added on these pins to
provide filtering against noise glitches.
As system complexity continues to increase, voltage regulation is becoming more important. A key element of any
voltage regulation scheme is its current sourcing capability. Like all Flash memories, the peak current for DataFlash
devices occurs during the programming and erasing operations. The supply voltage regulator needs to be able to supply
this peak current requirement. An under specified regulator can cause current starvation. Besides increasing system
noise, current starvation during programming or erasing can lead to improper operation and possible data corruption.
AT45DB081E [PRELIMINARY DATASHEET]
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DS-45DB081E-028C–DFLASH–10/2013
18. Electrical Specifications
18.1 Absolute Maximum Ratings*
Temperature under Bias . . . . . . . -55°C to +125°C
Storage Temperature. . . . . . . . . . -65°C to +150°C
*Notice: Stresses beyond those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. The
“Absolute Maximum Ratings” are stress ratings only and
functional operation of the device at these or any other
conditions beyond those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods
may affect device reliability. Voltage extremes referenced in
the “Absolute Maximum Ratings” are intended to
All Input Voltages
(except VCC but including NC pins)
with Respect to Ground. . . . . .-0.6V to VCC + 0.6V
accommodate short duration undershoot/overshoot
conditions and does not imply or guarantee functional device
operation at these levels for any extended period of time.
All Output Voltages
with Respect to Ground. . . . . .-0.6V to VCC + 0.6V
18.2 DC and AC Operating Range
AT45DB081E
-40C to 85C
1.65V to 3.6V
Operating Temperature (Case)
VCC Power Supply
Industrial
AT45DB081E [PRELIMINARY DATASHEET]
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DS-45DB081E-028C–DFLASH–10/2013
18.3 DC Characteristics
1.65V to 3.6V
Typ
2.3V to 3.6V
Symbol Parameter
Condition
Min
Max
Min
Typ
Max
Units
Ultra-Deep Power-Down
Current
IUDPD
All inputs at 0V or VCC
0.4
4.5
25
6
1
0.4
1
μA
Deep Power-Down
Current
CS, RESET, WP = VIH
All inputs at CMOS levels
IDPD
12
40
9
6
25
6
12
40
9
μA
μA
CS, RESET, WP = VIH
All inputs at CMOS levels
ISB
Standby Current
f = 1MHz; IOUT = 0mA (0x01);
mA
mA
mA
mA
mA
mA
Active Current, Low
Power Read (01h)
Operation
V
CC = 3.6V
ICC1
f = 15MHz; IOUT = 0mA (0x01);
7
11
12
15
16
12
7
11
12
15
16
12
V
CC = 3.6V
f = 50MHz; IOUT = 0mA;
10
12
14
8
10
12
14
8
V
CC = 3.6V
Active Current,
Read Operation
(1)(2)
ICC2
f = 85MHz; IOUT = 0mA;
V
CC = 3.6V
Active Current,
Program Operation
ICC3
CS = VCC
CS = VCC
Active Current,
Erase Operation
ICC4
ILI
Input Load Current
All inputs at CMOS levels
All inputs at CMOS levels
1
1
1
1
μA
μA
ILO
Output Leakage Current
VCC
0.3
x
VCC
0.3
x
VIL
Input Low Voltage
V
VCC
0.7
x
VCC
0.6
+
VCC
0.7
x
VCC
0.6
+
VIH
Input High Voltage
Output Low Voltage
Output High Voltage
V
V
V
VOL
VOH
IOL = 100μA
IOH = -100μA
0.4
0.4
VCC
0.2V
-
VCC -
0.2V
Notes: 1. Typical values measured at 3.0V at 25C.
2. CC2 during a Buffer Read is 20mA maximum @ 20MHz.
I
AT45DB081E [PRELIMINARY DATASHEET]
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DS-45DB081E-028C–DFLASH–10/2013
18.4 AC Characteristics
1.65V to 3.6V
2.3V to 3.6V
Symbol
fSCK
Parameter
Min
Max
70
Min
Max
85
Units
MHz
MHz
SCK Frequency
fCAR1
SCK Frequency for Continuous Read (0x0B)
70
85
SCK Frequency for Continuous Read (0x03)
(Low Frequency)
fCAR2
40
50
MHz
MHz
SCK Frequency for Continuous Read
(Low Power Mode – 01h Opcode)
fCAR3
15
85
15
fCAR4
tWH
SCK Frequency for Continuous Read (0x1B)
SCK High Time
104
MHz
ns
4
4
4
4
tWL
SCK Low Time
ns
(1)
tSCKR
SCK Rise Time, Peak-to-peak
SCK Fall Time, Peak-to-peak
Minimum CS High Time
CS Setup Time
0.1
0.1
30
6
0.1
0.1
30
5
V/ns
V/ns
ns
(1)
tSCKF
tCS
tCSS
tCSH
tSU
ns
CS Hold Time
5
5
ns
Data In Setup Time
2
2
ns
tH
Data In Hold Time
1
1
ns
tHO
Output Hold Time
0
0
ns
tDIS
tV
Output Disable Time
8
7
6
6
ns
Output Valid
ns
tWPE
tWPD
tLOCK
tEUDPD
WP Low to Protection Enabled
WP High to Protection Disabled
Freeze Sector Lockdown Time (from CS High)
CS High to Ultra-Deep Power-Down
1
1
μs
1
1
μs
200
3
200
3
μs
μs
Minimum CS Low Time to Exit Ultra-Deep
Power-Down
tCSLU
20
20
ns
tXUDPD
tEDPD
tRDPD
tXFR
Exit Ultra-Deep Power-Down Time
CS High to Deep Power-Down
Resume from Deep Power-Down Time
Page to Buffer Transfer Time
Page to Buffer Compare Time
RESET Pulse Width
240
3
120
3
μs
μs
μs
μs
μs
μs
μs
μs
35
35
200
220
200
220
tCOMP
tRST
10
10
tREC
RESET Recovery Time
1
1
tSWRST
Software Reset Time
35
35
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Note: 1. Values are based on device characterization, not 100% tested in production.
18.5 Program and Erase Characteristics
1.65V to 3.6V
2.3V to 3.6V
Symbol
tEP
Parameter
Min
Typ
15
2
Max
40
4
Min
Typ
15
2
Max
40
4
Units
ms
ms
μs
Page Erase and Programming Time (256/264 bytes)
Page Programming Time
Byte Programming Time
Page Erase Time
tP
tBP
8
8
tPE
12
30
.7
35
75
12
30
.7
35
75
ms
ms
s
tBE
Block Erase Time
tSE
Sector Erase Time
1.3
20
1.3
20
tCE
Chip Erase Time
10
10
20
10
20
200
10
10
20
10
20
200
s
Program
20
20
tSUSP
Suspend Time
Erase
μs
40
40
Program
20
20
tRES
Resume Time
μs
μs
Erase
40
40
tOTPP
OTP Security Register Program Time
500
500
Notes: 1. Values are based on device characterization, not 100% tested in production.
2. Not 100% tested (value guaranteed by design and characterization).
19. Input Test Waveforms and Measurement Levels
0.9VCC
AC
AC
Driving
Levels
VCC/2
Measurement
Level
0.1VCC
t , t < 2ns (10% to 90%)
R
F
20. Output Test Load
Device
Under
Test
30pF
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21. Utilizing the RapidS Function
To take advantage of the RapidS function's ability to operate at higher clock frequencies, a full clock cycle must be used
to transmit data back and forth across the serial bus. The DataFlash is designed to always clock its data out on the falling
edge of the SCK signal and clock data in on the rising edge of SCK.
For full clock cycle operation to be achieved, when the DataFlash is clocking data out on the falling edge of SCK, the host
controller should wait until the next falling edge of SCK to latch the data in. Similarly, the host controller should clock its
data out on the rising edge of SCK in order to give the DataFlash a full clock cycle to latch the incoming data in on the
next rising edge of SCK.
Figure 21-1. RapidS Mode
Slave CS
1
8
1
8
1
2
3
4
5
6
7
2
3
4
5
6
7
SCK
MOSI
MISO
B
E
A
C
D
MSB
LSB
BYTE-MOSI
H
G
I
F
MSB
LSB
BYTE-SO
MOSI = Master Out, Slave In
MISO = Master In, Slave Out
The Master is the host controller and the Slave is the DataFlash.
The Master always clocks data out on the rising edge of SCK and always clocks data in on the falling edge of SCK.
The Slave always clocks data out on the falling edge of SCK and always clocks data in on the rising edge of SCK.
A. Master clocks out first bit of BYTE-MOSI on the rising edge of SCK
B. Slave clocks in first bit of BYTE-MOSI on the next rising edge of SCK
C. Master clocks out second bit of BYTE-MOSI on the same rising edge of SCK
D. Last bit of BYTE-MOSI is clocked out from the Master
E. Last bit of BYTE-MOSI is clocked into the slave
F. Slave clocks out first bit of BYTE-SO
G. Master clocks in first bit of BYTE-SO
H. Slave clocks out second bit of BYTE-SO
I. Master clocks in last bit of BYTE-SO
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Figure 21-2. Command Sequence for Read/Write Operations for Page Size 256 bytes
(Except Status Register Read, Manufacturer and Device ID Read)
SI (INPUT)
CMD
8-bits
8-bits
8-bits
X X X X X X X X X X X X X X X X X X X X X X X X
LSB
MSB
4 Dummy Bits
Page Address
(A19 - A8)
Byte/Buffer Address
(A7 - A0/BFA7 - BFA0)
Figure 21-3. Command Sequence for Read/Write Operations for Page Size 264 bytes
(Except Status Register Read, Manufacturer and Device ID Read)
SI (INPUT)
CMD
8-bits
8-bits
8-bits
X X X X X X X X X X X X X X X X X X X X X X X X
LSB
MSB
3
Page Address
(PA11 - PA0)
Byte/Buffer Address
(BA8 - BA0/BFA8 - BFA0)
Dummy Bits
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22. AC Waveforms
Four different timing waveforms are shown in Figure 22-1 through Figure 22-4. Waveform 1 shows the SCK signal being
low when CS makes a high-to-low transition and Waveform 2 shows the SCK signal being high when CS makes a
high-to-low transition. In both cases, output SO becomes valid while the SCK signal is still low (SCK low time is specified
as tWL). Timing Waveforms 1 and 2 conform to RapidS serial interface but for frequencies up to 85MHz. Waveforms 1
and 2 are compatible with SPI Mode 0 and SPI Mode 3, respectively.
Waveform 3 and 4 illustrate general timing diagram for RapidS serial interface. These are similar to Waveform 1 and 2,
except that output SO is not restricted to become valid during the tWL period. These timing waveforms are valid over the
full frequency range (maximum frequency = 85MHz) of the RapidS serial case.
Figure 22-1. Waveform 1 = SPI Mode 0 Compatible
tCS
CS
tCSS
tWH
tWL
tCSH
SCK
SO
SI
tV
tHO
tDIS
High-impedance
tSU
High-impedance
Valid Out
tH
Valid In
Figure 22-2. Waveform 2 = SPI Mode 3 Compatible
tCS
CS
tCSS
tWL
tWH
tCSH
SCK
SO
tV
tHO
tDIS
High Z
High-impedance
Valid Out
tH
tSU
Valid In
SI
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Figure 22-3. Waveform 3 = RapidS Mode 0
tCS
CS
tCSS
tWH
tWL
tCSH
SCK
SO
SI
tV
tHO
tDIS
High-impedance
tSU
High-impedance
Valid Out
tH
Valid In
Figure 22-4. Waveform 4 = RapidS Mode 3
tCS
CS
tCSS
tWL
tWH
tCSH
SCK
SO
tV
tHO
tDIS
High Z
High-impedance
Valid Out
tH
tSU
Valid In
SI
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23. Write Operations
The following block diagram and waveforms illustrate the various write sequences available.
Figure 23-1. Block Diagram
WP
Flash Memory Array
Page (256/264 bytes)
Buffer 1 (256/264 bytes)
Buffer 2 (256/264 bytes)
SCK
CS
RESET
I/O Interface
V
CC
GND
SI
SO
Figure 23-2. Buffer Write
Completes Writing into Selected Buffer
CS
Binary Page Size
16 Dummy Bits + BFA7-BFA0
CMD
X
X
BFA7-0
n
n + 1
Last Byte
SI (Input)
n
= 1st byte read
Each transition represents eight bits
n+1 = 2nd byte read
Figure 23-3. Buffer to Main Memory Page Program
Starts Self-timed Erase/Program Operation
CS
Binary Page Size
A19-A8 + 8 Dummy Bits
CMD
XXXX,A19-A16
A15-A8
XXXX XXXX
SI (Input)
Each transition represents eight bits
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24. Read Operations
The following block diagram and waveforms illustrate the various read sequences available.
Figure 24-1. Block Diagram
Flash Memory Array
Page (256/264 bytes)
Main Memory
Page To
Main Memory
Page To
Buffer 2
Buffer 1
Buffer 1 (256/264 bytes)
Buffer 2 (256/264 bytes)
Buffer 1
Read
Main Memory
Page Read
Buffer 2
Read
I/O Interface
SO
Figure 24-2. Main Memory Page Read
CS
Address for Binary Page Size
XXXXX,A19-A16 A15-A8 A7-A0
CMD
XXX,PA11-7 PA6-0, BA8
BA7-0
X
X
SI (Input)
4 Dummy Bytes
SO (Output)
n
n + 1
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Figure 24-3. Main Memory Page to Buffer Transfer
Data From the selected Flash Page is read into either SRAM Buffer
Starts Reading Page Data into Buffer
CS
Binary Page Size
XXXX, A19-A16
+
A15- A8 + 8 Dummy Bits
CMD
XXX, PA11-7
PA6-0, XX XXXX XXXX
SI (Input)
SO (Output)
Figure 24-4. Buffer Read
CS
Address for Binary Page Size
16 Dummy Bits + BFA7-BFA0
CMD
XXXX XXXX XXXX XXXX
BFA7-0
X
SI (Input)
No Dummy Byte (opcodes D1H and D3H)
1 Dummy Byte (opcodes D4H and D6H)
SO (Output)
n
n + 1
Each transition represents eight bits
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25. Detailed Bit-level Read Waveforms: RapidS Mode 0/Mode 3
Figure 25-1. Continuous Array Read (Legacy Opcode E8h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34
62 63 64 65 66 67 68 69 70 71 72
SCK
SI
Opcode
Address Bits
32 Dummy Bits
1
1
1
0
1
0
0
0
A
A
A
A
A
A
A
A
A
X
X
X
X
X
X
MSB
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
Bit 0 of
Page n+1
Bit 2048/2112
of Page n
Figure 25-2. Continuous Array Read (Opcode 0Bh)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
SCK
SI
Opcode
Address Bits A19 - A0
Dummy Bits
X
0
0
0
0
1
0
1
1
A
A
A
A
A
A
A
A
A
X
X
X
X
X
X
X
MSB
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
Figure 25-3. Continuous Array Read (Opcode 01h or 03h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40
SCK
SI
Opcode
Address Bits A19-A0
0
0
0
0
0
0
1
1
A
A
A
A
A
A
A
A
A
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
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Figure 25-4. Main Memory Page Read (Opcode D2h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34
62 63 64 65 66 67 68 69 70 71 72
SCK
SI
Opcode
Address Bits
32 Dummy Bits
1
1
0
1
0
0
1
0
A
A
A
A
A
A
A
A
A
X
X
X
X
X
X
MSB
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
Figure 25-5. Buffer Read (Opcode D4h or D6h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
SCK
Address Bits
Binary Page Size = 16 Dummy Bits + BFA7-BFA0
Standard DataFlash Page Size =
15 Dummy Bits + BFA8-BFA0
Dummy Bits
Opcode
1
1
0
1
0
1
0
0
X
X
X
X
X
X
A
A
A
X
X
X
X
X
X
X
X
SI
MSB
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
Figure 25-6. Buffer Read – Low Frequency (Opcode D1h or D3h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40
SCK
Address Bits
Binary Page Size = 16 Dummy Bits + BFA7-BFA0
Standard DataFlashPage Size =
Opcode
15 Dummy Bits + BFA8-BFA0
1
1
0
1
0
0
0
1
X
X
X
X
X
X
A
A
A
SI
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
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Figure 25-7. Read Sector Protection Register (Opcode 32h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40
SCK
SI
Opcode
Dummy Bits
0
0
1
1
0
0
1
0
X
X
X
X
X
X
X
X
X
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
Figure 25-8. Read Sector Lockdown Register (Opcode 35h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40
SCK
SI
Opcode
Dummy Bits
0
0
1
1
0
1
0
1
X
X
X
X
X
X
X
X
X
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
Figure 25-9. Read Security Register (Opcode 77h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12
29 30 31 32 33 34 35 36 37 38 39 40
SCK
SI
Opcode
Dummy Bits
0
1
1
1
0
1
1
1
X
X
X
X
X
X
X
X
X
MSB
MSB
Data Byte 1
High-impedance
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
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Figure 25-10. Status Register Read (Opcode D7h)
CS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SCK
SI
Opcode
1
1
0
1
0
1
1
1
MSB
Status Register Data
Status Register Data
High-impedance
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
SO
MSB
MSB
MSB
Figure 25-11. Manufacturer and Device Read (Opcode 9Fh)
CS
0
6
7
8
14 15 16
22 23 24
30 31 32
38 39 40
46
SCK
SI
Opcode
9Fh
High-impedance
1Fh
25h
00h
01h
EDI
00h
EDI
SO
Manufacturer ID
Device ID
Byte 1
Device ID
Byte 2
String Length
Data Byte 1
Note: Each transition
shown for SI and SO represents one byte (8 bits)
Figure 25-12.Reset Timing
CS
t
t
CSS
REC
SCK
RESET
t
RST
High Impedance
High Impedance
SO (Output)
SI (Input)
Note: 1. The CS signal should be in the high state before the RESET signal is deasserted.
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26. Auto Page Rewrite Flowchart
Figure 26-1. Algorithm for Programming or Re-programming of the Entire Array Sequentially
START
Provide Address
and Data
Buffer Write
(84h, 87h)
Main Memory Page Program
through Buffer
(82h, 85h)
Buffer To Main
Memory Page Program
(83h, 86h)
END
Notes: 1. This type of algorithm is used for applications in which the entire array is programmed sequentially, filling the
array page-by-page.
2. A page can be written using either a Main Memory Page Program operation or a buffer write operation
followed by a buffer to Main Memory Page Program operation.
3. The algorithm above shows the programming of a single page. The algorithm will be repeated sequentially
for each page within the entire array.
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Figure 26-2. Algorithm for Programming or Re-programming of the Entire Array Randomly
START
Provide Address of
Page to Modify
Main Memory Page
to Buffer Transfer
(53h, 55h)
If planning to modify multiple
bytes currently stored within
a page of the Flash array
Buffer Write
(84h, 87h)
Main Memory Page Program
through Buffer
(82h, 85h)
Buffer to Main
Memory Page Program
(83h, 86h)
Auto Page Rewrite(2)
(58h, 59h)
Increment Page
Address Pointer(2)
END
Notes: 1. To preserve data integrity, each page of an DataFlash sector must be updated/rewritten at least once within
every 50,000 cumulative page erase and program operations.
2. A page address pointer must be maintained to indicate which page is to be rewritten. The Auto Page
Rewrite command must use the address specified by the page address pointer.
3. Other algorithms can be used to rewrite portions of the Flash array. Low-power applications may choose to
wait until 50,000 cumulative page erase and program operations have accumulated before rewriting all
pages of the sector.
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27. Ordering Information (Standard DataFlash Page Size)
27.1 Ordering Detail
A T 4 5 D B 0 8 1 E - S S H N - B
Designator
Shipping Carrier Option
B
T
Y
= Bulk (tubes)
= Tape and reel
= Trays
Product Family
45DB = DataFlash
Operating Voltage
N
= 1.65V minimum (1.65V to 3.6V)
Device Density
08 = 8-Mbit
Device Grade
H
= Green, NiPdAu lead finish,
Industrial temperature range
(–40°C to +85°C)
Interface
1 = Serial
Device Revision
Package Option
SS = 8-lead, 0.150” narrowde SOIC
S
= 8-lead, 0.208” wide SOIC
= 8-pad, 5 x 6 x 0.6mm UDFN
M
27.2 Ordering Codes (Standard DataFlash Page Size)
Ordering Code
Package
Lead Finish
Operating Voltage
fSCK
Device Grade
AT45DB081E-SSHN-B (1)
AT45DB081E-SSHN-T(1)
AT45DB081E-SHN-B(1)(2)
AT45DB081E-SHN-T(1)(2)
AT45DB081E-MHN-Y(1)
AT45DB081E-MHN-T(1)
8S1
Industrial
8S2
NiPdAu
1.65V to 3.6V
85MHz
(-40C to 85C)
8MA1
Notes: 1. The shipping carrier suffix is not marked on the device.
2. Not recommended for new design. Use the 8S1 package option.
Package Type
8S1
8-lead 0.150" wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8-lead 0.208" wide, Plastic Gull Wing Small Outline (EIAJ SOIC)
8S2
8MA1
8-pad (5 x 6 x 0.6mm body), Thermally Enhanced Plastic Ultra Thin Dual Flat No-lead (UDFN)
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27.3 Ordering Codes (Binary Page Size)
Ordering Code
Package
8S1
Lead Finish
Operating Voltage
fSCK
Device Grade
AT45DB081E-SSHN2B-T(1)(3)
AT45DB081E-SHN2B-T(1)(2)(3)
AT45DB081E-MHN2B-T (1)(3)
Industrial
8S2
NiPdAu
1.65V to 3.6V
85MHz
(-40C to 85C)
8MA1
Notes: 1. The shipping carrier suffix is not marked on the device.
2. Not recommended for new design. Use the 8S1 package option.
3. Parts ordered with suffix code ‘2B’ are shipped in tape and reel (T&R) with the page size set to
256 bytes. This option is only available for shipping in T&R (-T).
Package Type
8S1
8-lead 0.150" wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8-lead 0.208" wide, Plastic Gull Wing Small Outline (EIAJ SOIC)
8-pad (5 x 6 x 0.6mm body), Thermally Enhanced Plastic Ultra Thin Dual Flat No-lead (UDFN)
8S2
8MA1
27.4 Ordering Codes (Reserved)
Ordering Code
Package
Lead Finish
Operating Voltage
fSCK
Device Grade
AT45DB081E-SSHNHA-T(1)(2)
AT45DB081E-SHNHA-T(1)(2)
AT45DB081E-SSHNHC-T(1)(3)
AT45DB081E-SHNHC-T(1)(3)
8S1
8S2
8S1
8S2
Industrial
NiPdAu
1.65V to 3.6V
85MHz
(-40C to 85C)
Notes: 1. The shipping carrier suffix is not marked on the device.
2. Parts ordered with suffix code ‘HA’ are shipped in tape & reel (T&R) only with the page size set to 264 bytes.
3. Parts ordered with suffix code ‘HC’ are shipped in tape & reel (T&R) only with the page size set to 256 bytes.
4. Please contact Adesto for a description of these ‘Reserved’ codes.
Package Type
8S1
8-lead 0.150" wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
8-lead 0.208" wide, Plastic Gull Wing Small Outline (EIAJ SOIC)
8-pad (5 x 6 x 0.6mm body), Thermally Enhanced Plastic Ultra Thin Dual Flat No-lead (UDFN)
8S2
8MA1
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28. Packaging Information
28.1 8S1 – 8-lead JEDEC SOIC
C
1
E
E1
L
N
Ø
TOP VIEW
END VIEW
e
b
COMMON DIMENSIONS
(Unit of Measure = mm)
A
MIN
1.35
0.10
MAX
1.75
0.25
NOM
–
–
NOTE
SYMBOL
A1
A
A1
b
0.31
0.17
4.80
3.81
5.79
–
0.51
0.25
5.05
3.99
6.20
C
D
E1
E
e
–
–
D
–
–
SIDE VIEW
Notes: This drawing is for general information only.
Refer to JEDEC Drawing MS-012, Variation AA
for proper dimensions, tolerances, datums, etc.
1.27 BSC
L
0.40
0°
–
–
1.27
8°
Ø
6/22/11
DRAWING NO. REV.
8S1
TITLE
GPC
8S1, 8-lead (0.150” Wide Body), Plastic Gull Wing
Small Outline (JEDEC SOIC)
SWB
G
Package Drawing Contact:
contact@adestotech.com
AT45DB081E [PRELIMINARY DATASHEET]
65
DS-45DB081E-028C–DFLASH–10/2013
28.2 8S2 – 8-lead EIAJ SOIC
C
1
E
E1
L
N
q
TOP VIEW
END VIEW
e
b
COMMON DIMENSIONS
(Unit of Measure = mm)
A
MIN
1.70
0.05
0.35
0.15
5.13
5.18
7.70
0.51
0°
MAX
2.16
0.25
0.48
0.35
5.35
5.40
8.26
0.85
8°
NOM
NOTE
SYMBOL
A1
A
A1
b
4
4
C
D
E1
E
D
2
L
SIDDEE VVIIEEW
q
e
1.27 BSC
3
Notes: 1. This drawing is for general information only; refer to EIAJ Drawing EDR-7320 for additional information.
2. Mismatch of the upper and lower dies and resin burrs aren't included.
3. Determines the true geometric position.
4. Values b,C apply to plated terminal. The standard thickness of the plating layer shall measure between 0.007 to .021 mm.
4/15/08
REV.
GPC
DRAWING NO.
TITLE
8S2, 8-lead, 0.208” Body, Plastic Small
Outline Package (EIAJ)
Package Drawing Contact:
contact@adestotech.com
STN
8S2
F
AT45DB081E [PRELIMINARY DATASHEET]
66
DS-45DB081E-028C–DFLASH–10/2013
28.3 8MA1 – 8-pad UDFN
E
C
Pin 1 ID
SIDE VIEW
D
y
TOP VIEW
A1
A
K
E2
Option A
0.45
Pin #1
8
1
2
3
Pin #1 Notch
(0.20 R)
Chamfer
(C 0.35)
COMMON DIMENSIONS
(Unit of Measure = mm)
(Option B)
MIN
MAX
NOM
NOTE
SYMBOL
7
A
0.45
0.55
0.60
e
D2
A1
b
0.00
0.35
0.02
0.40
0.152 REF
5.00
4.00
6.00
3.40
1.27
0.60
–
0.05
0.48
6
C
D
D2
E
4.90
3.80
5.90
3.20
5.10
4.20
6.10
3.60
5
4
b
BOTTOM VIEW
L
E2
e
L
0.50
0.00
0.20
0.75
0.08
–
y
K
–
4/15/08
GPC
YFG
DRAWING NO.
TITLE
REV.
Package Drawing Contact: 8MA1, 8-pad (5 x 6 x 0.6 mm Body), Thermally
8MA1
D
contact@adestotech.com
Enhanced Plastic Ultra Thin Dual Flat No Lead
Package (UDFN)
AT45DB081E [PRELIMINARY DATASHEET]
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DS-45DB081E-028C–DFLASH–10/2013
29. Revision History
Doc. Rev.
Date
Comments
DS-45DB081E-028A
6/2013
Initial document release.
Updated Auto Page Rewrite cycle to 50,000 cumulative page erase/program
operations. Added reserved part order codes. Updated DC and AC parameters and
Power Up Timing. Added Exit Ultra-Deep Power-Down (Chip Select Low). Updated ICC3
DS-45DB081E-028B
DS-45DB081E-028C
9/2013
,
ICC4, and VOL conditions. Changed datasheet status from advanced to preliminary.
Updated spec for Input High Voltage (Max) to VCC + 0.6V. Corrected Low Power Read
Option (up to 15MHz).
10/2013
AT45DB081E [PRELIMINARY DATASHEET]
68
DS-45DB081E-028C–DFLASH–10/2013
Corporate Office
California | USA
Adesto Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: (+1) 408.400.0578
Email: contact@adestotech.com
© 2013 Adesto Technologies. All rights reserved. / Rev.: DS-45DB081E-028C–DFLASH–10/2013
Adesto®, the Adesto logo, CBRAM®, and DataFlash® are registered trademarks or trademarks of Adesto Technologies. All other marks are the property of their respective
owners.
Disclaimer: Adesto Technologies Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Adesto's Terms
and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications
detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Adesto are granted by the
Company in connection with the sale of Adesto products, expressly or by implication. Adesto's products are not authorized for use as critical components in life support devices or systems.
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