26678A [ETC]
SecSi Sector Customer Lock Status Check ; SecSi行业客户锁定状态检查\n
| 型号： | 26678A |
| 厂家： | 
ETC |
| 描述： | SecSi Sector Customer Lock Status Check
|
| 文件： | 总4页 (文件大小：66K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SecSi Sector
Customer Lock Status Check
Application Note
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For More Information
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Publication Number 26678 Revision A Amendment 0 Issue Date July 9, 2002
Preliminary
Secured Silicon (SecSi) Sector Customer
Lock Status Check
Application Note
This application note assumes that users are famliar
Memory Architecture
with Flash Technology and HW/SW System Design,
including but not restricted to memory architecture,
autoselect mode definitions, and software command
sequences.
The SecSi Sector area is a separate memory area from
the main memory area. The SecSi Sector is commonly
referred to as a one time programmable (OTP) memory
area. The main memory area may be programmed and
erased up to 1 million times, while the SecSi Sector
area can be programmed multiple times before the
SecSi Sector is locked. If the SecSi Sector is 256 bytes,
then a “1” can be programmed to a “0” and cannot be
erased back to a “1” before locking. If the SecSi Sector
is 64 kbytes, all program and erase operations are
allowed before locking. The SecSi Sector is enabled
through initiation of the “SecSi Sector Entry” command.
The SecSi Sector can be disabled through the “SecSi
Sector Exit” or “Reset” command. Illustrated in Figure
1 is the standard AMD memory architecture.
Introduction
AMD offers Flash devices that come with the SecSi
Sector either factory locked through the Express
FlashTM Service, or customer lockable. When the
SecSi Sector is not locked at the AMD factory, DQ7 of
the Autoselect Byte 3 at address 03h will be perma-
nently set to a ‘0’. For customer locking of the SecSi
Sector, the user has to determine if the SecSi Sector
area has been locked or an error has occurred during
the locking process. This document will provide a pro-
cedure for the user to check the locking status of the
SecSi Sector area when the SecSi Sector is not factory
locked.
SecSi Sector
Memory Array
“SecSi Sector
Entry”
Command
“SecSi Sector Exit”
Command
Figure 1. Standard AMD Memory Architecture
When reading from the main memory array, the
Valid Implementation of the SecSi Sector
Customer Lock
address of the sector is required to read out data stored
in that particular sector. To program a sector within the
main memory array, a 4-cycle programming sequence
is needed. Reading and programming of the SecSi
Sector requires the “SecSi Sector Entry” command to
be issued before any read or programming operations
are to occur. After reading or programming of the SecSi
Sector is completed, the “SecSi Sector Exit” or “Reset”
command has to be issued to revert the pointer back to
the main memory array.
Since there are no status bits allocated for SecSi
Sector Customer Lock Status Check, the following pro-
cedure has to be followed to correctly lock the SecSi
Sector area.
The complete software command procedure must be
used to program and verify the SecSi Sector Customer
Lock Status. This example is shown in Figure 2,
Program and Verify section. High voltage in Figure 2 is
not needed. If the user only wishes to check the SecSi
Sector Customer Lock Status, two steps allocated only
Publication# 26678 Rev: A Amendment/0
Issue Date: July 9, 2002
1
for locking of the SecSi Sector MUST be skipped. This
example is shown in Figure 2, Verify Only section.
SecSi Sector Entry Command
Write #60 to any address
SecSi Sector Entry Command
Write #60 to any address
Write #60 with SecSi Sector
A6=0, A1=1, A0=0
Wait 150us
Write #40 with SecSi Sector
A6=0, A1=1, A0=0
Write #40 with SecSi Sector
A6=0, A1=1, A0=0
Read with SecSi Sector
Address
NO
NO
SecSi
Sector
Unlocked
PLSCNT
Pulse
Count
DQ0 = 1?
DQ0 = 1?
Expected DQ0 Data=1 for
Protected
and =0 for Unprotected
YES
SecSi Sector Locked
Verify Only
YES
SecSi Sector Locked
Program and Verify
Figure 2. Program and Verify Algorithm
The software algorithms illustrated in Figure 2 are very
similar to the “In-System Sector Protection Algorithm”
figures listed in AMD Flash memory datasheets. After
verifying that the SecSi Sector has been properly
locked, either a “SecSi Sector Exit” or “Reset”
command may be issued to allow access to the main
memory array.
Invalid Implementation of the SecSi Sector
Customer Lock
Many customers may think that using the Autoselect
Byte 2, the “Sector Protection Verification” bit DQ0,
after entering the SecSi Sector area may read out the
Sector Customer Lock Status Bit. This is an incorrect
assumption. Flow and architectural diagrams illus-
trating the invalid implementation of the SecSi Sector
Customer Lock Status Check are Figures 3 and 4.
2
Secured Silicon (SecSi) Sector Customer Lock Status Check
Step 1
Step 2
Step 3
Step 4
SecSi Sector Entry Command
Autoselect Command
SecSi Sector gets reset
Pointer will point to
outermost sector of main
memory array
Read Autoselect Byte 2
SecSi Sector Exit Command
Figure 3. Invalid Command Implementation
SecSi Sector
Memory Array
Autoselect
Command
“SecSi Sector Entry”
Command
Figure 4. Resulting Memory Pointer Location
When issuing the Autoselect command after entering
the SecSi Sector, the pointer will reset itself to point to
the main memory array. Therefore reading Autoselect
Byte 2 will indicate the locking status of boot sector in
the picture above, not the SecSi Sector Customer Lock
Status.
Conclusion
Implementing the SecSi Sector Customer Lock Status
Algorithm will help the user to check the locking status
of the SecSi Sector through software command
sequences with ease. High voltage power supply is not
required to implement the Customer Lock Status
Algorithm.
Secured Silicon (SecSi) Sector Customer Lock Status Check
3
相关型号：
267-.25%-FA2-90PPM-CARDPACK
Fixed Resistor, Wire Wound, 2W, 0.267ohm, 65V, 0.25% +/-Tol, -90,90ppm/Cel,
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