EP7312-90 [CIRRUS]
New ARM720T 90 MHz Embedded Processor Allows Faster than Real-Time Recording; 新的ARM720T 90 MHz的嵌入式处理器允许比实时更快的记录
| 型号： | EP7312-90 |
| 厂家： | 
CIRRUS LOGIC |
| 描述： | New ARM720T 90 MHz Embedded Processor Allows Faster than Real-Time Recording |
| 文件： | 总4页 (文件大小：549K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EP7312-90
Leading the Digital Entertainment RevolutionTM
P R O D U C T B U L L E T I N
New ARM720T 90 MHz Embedded Processor
Allows Faster than Real-Time Recording
EP7312-90 Features
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ARM720T processor
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ARM7TDMI CPU
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8 Kbytes of four-way set-associative cache
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MMU with 64-entry TLB (translation look-
aside buffer)
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Write buffer
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Thumb code support enabled
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90 MHz & 74 MHz clock speeds
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MaverickKey™ IDs for DRM
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32-bit unique ID
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128-bit random ID
The EP7312-90 is one of the world's fastest ARM-7 embedded
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Ultra low power
processors today—with clock speeds of up to 90 MHz, it allows for
real-time MP3 encoding, as well as decoding for all major digital
music standards. The EP7312-90 also supports WMA, MP3, and
AAC playback. With faster than real-time MP3 encoding capability,
the need for a personal computer to create digital audio content is
eliminated. Now, manufacturers can easily build portable rotating
media and flash-based audio players that record and store CD/MP3
data during playback—more than ten hours of music content to be
stored on a single CD-RW disc.
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Designed for applications that require long
battery life while using standard AA/AAA
batteries or rechargeable cells
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Typical power numbers
— 90 mW at 74 MHz typical
— 108 mW at 90 MHz typical
— <.03 mW in the Standby State
The EP7312-90 delivers high performance with low power,
permitting advanced user interfaces and operating systems in
battery powered entertainment devices. A digital audio interface
(DAI) provides a glueless connection to today's most popular DACs
and ADCs, enabling scalable audio performance and price points. It
also includes our patent-pending MaverickKey™ technology, which
provides consumer Internet product manufacturers with on-chip
security utilizing specific hardware IDs, such as those assigned for
DRM or other authentication mechanisms.
Actual Size
Design in the EP7312-90 for a wide range of consumer
entertainment products, including portable and set-top digital audio
devices, car audio jukebox systems, as well as general-purpose
controller applications.
For more information, visit us at www.cirrus.com
EP7312-90 Features (cont.)
Advanced audio decoder/decompression capability
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48 Kbytes (0x9600) of on-chip SRAM for fast program
execution and/or as a frame buffer
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Allows support of multiple audio decompression
algorithms
Two synchronous serial interfaces
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Supports MPEG 1, 2, and 2.5 layer 3 audio decoding,
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ADC (SSI) Interface: Master mode only; SPI and
including ISO compliant MPEG 1 and 2 layer 3
support for all standard sample rates and bit rates
Microwire1-compatible (128 Kbits/s operation)
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27 general-purpose input/output pins
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Supports bit streams with adaptive bit rates
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Three 8-bit and one 3-bit GPIO port
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Improved DAI (Digital Audio Interface) providing
glueless interface to low-power DACs, ADCs, and
CODECs
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Supports scanning keyboard matrix
Two UARTs (16550 type)
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Supports bit rates up to 115.2 Kbits/s
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SDRAM controller
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Contains two 16-byte FIFOs for TX and RX
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Supports two memory banks of up to 256 Mbits in
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UART1 supports modem counter signals
size
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SDRAM memory interface is programmable from 4
to 32 bits wide
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SIR (up to 115.2 kbps) infrared encoder
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IrDA (Infrared Data Association) SIR protocol
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encoder/decoder
LCD controller
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Interfaces directly to a single-scan panel
DC-to-DC converter interface (PWM)
monochrome or color STN LCD
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Provides two 96 kHz clock outputs with
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Panel width size is programmable from 32 to 1024
pixels in 16-pixel increments
programmable duty ration (from 1-in-16 to 15-in-16)
that can be used to drive a DC to DC converter
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Video frame buffer size programmable up to 128
Kbytes
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Two timer counters
Evaluation kit with schematics, sample code, and
design database
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Memory controller
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Decodes up to 6 separate memory segments of up
to 256 Mbytes each
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Support for up to two ultra-low power CL-PS6700 PC
card controllers
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Each segment can be configured as 8, 16, or 32 bits
wide with support for page-mode access
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Dedicated LED flasher pin from the RTC
Full JTAG boundary scan and Embedded ICE support
Commercial and Industrial temperature range
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Programmable access time for conventional
ROM/SRAM/FLASH memory
Optimized for low power dissipation and fabricated on
a fully static 0.25 micon CMOS process
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Supports removable FLASH card interface
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Enables connection to removable FLASH card for
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addition of expansion FLASH memory modules
Available in 208 LQFP, 256 PBGA, & 204 TFBGA
For more information, visit us at www.cirrus.com
EP7312-90
Overview
Power Management
The second is the programmable 4 or 32-bit-wide SDRAM
interface that allows direct connection of up to two banks of
SDRAM, each bank containing up to 256 Mbits. To assure the
lowest possible power consumption, the EP7312 supports
self-refresh DRAMs, which are placed in a low-power Standby
State.
The EP7312-90 is designed for ultra-low power operation. Its
core operates at only 2.5 V, while I/O has an operational range
of 2.5 V to 3.3 V. The device has three basic power states:
Operating—This state is the full performance state. All the
clocks and peripheral logic are enabled.
A DMA address generator is also provided that fetches video
display data for the LCD controller from main SDRAM
memory. The display frame buffer start address is
programmable. In addition, the built-in LCD controller can
utilize external or internal SRAM for memory, thus eliminating
the need for SDRAMs.
Idle—This state is the same as the Operating State,
except the CPU clock is halted while waiting for an event
such as a key press.
Standby—This state is equivalent to the computer being
switched off (no display) and the main oscillator shut
down. An event such as a key press can wake-up the
processor.
Digital Audio Capability
The EP7312-90 includes its powerful 32-bit RISC processing
engine to implement audio decompression algorithms in
software. The nature of the on-board RISC processor and the
availability of efficient C-compilers and other software
development tools ensures that a wide range of audio
decompression algorithms can easily be ported to and run on
the EP7312-90.
MaverickKey™ Unique ID
MaverickKey unique hardware programmed IDs are a solution
the growing concern over secure web content and commerce.
With Internet security playing an important role in the delivery
of digital media such as books or music, traditional software
methods are quickly becoming unreliable. The MaverickKey
unique IDs provide OEMs with a method of utilizing specific
hardware IDs such as those assigned for DRM (Digital Right
Management) or any other authentication mechanism.
Serial Interfaces
The EP7312-90 includes two 16550-type UARTs for RS-232
serial communications, both of which have two 16-byte FIFOs
for receiving and transmitting data. The UARTs support bit
rates up to 115.2 kbits/s. An IrDA SIR protocol
encoder/decoder can be optionally switched into the RX/TX
signals to drive an infrared communication interface directly.
Both a specific 32-bit ID as well as a 128-bit random ID is
programmed into the EP7312-90 through the use of laser
probing technology. These IDs can then be used to match
secure copyrighted content with the ID of the target device the
EP7312-90 is powering, and then deliver the copyrighted
information over a secure connection. In addition, secure
transactions can benefit by also matching device IDs to server
IDs. MaverickKey IDs provide a level of hardware security
required for today’s Internet appliances.
Improved Digital Audio Interface (DAI)
The EP7312-90 integrates an interface to enable a direct
connection to many low cost, low power, high quality audio
converters. In particular, the DAI can directly interface with the
Cirrus CS43L41/42/43 low-power audio DACs and CS55L32
low-power ADC. Among the features for these devices are:
digital bass and treble boost, digital volume control, and
compressor-limiter functions.
Memory Interfaces
There are two main external memory interfaces. The first is the
ROM/SRAM/FLASH-style interface that has programmable
wait-state timings and includes burst-mode capability, with
eight chip selects decoding six 256 Mbyte sections of
addressable space. For maximum flexibility, each bank can be
specified to be 8, 16, or 32-bits wide. This allows the use of 8-
bit wide boot ROM options to minimize system memory
requirements and cost, the ARM Thumb instruction set is
supported providing for the use of high-speed 32-nbit
operations in 16-bit op-codes and yielding industry-leading
code density.
Packaging
The EP7312-90 is available in a 208-pin LQFP package and a
256-ball PBGA package.
System Design
As shown in the system block diagram (page 4), simply adding
desired memory and peripherals to the highly integrated
EP7312-90 completes a low-power system solution. All
necessary interface logic is integrated on-chip.
For more information, visit us at www.cirrus.com
EP7312-90
Cirrus Logic, Inc.
W O R L D W I D E S A L E S O F F I C E S
Corporate Headquarters
2901 Via Fortuna
Austin, Texas 78746
USA
T: (800) 888-5016
T: (512) 851-4000
F: (512) 851-4977
www.cirrus.com
United States
Japan
Asia
Europe
Cirrus Logic, Inc.
Cirrus Logic K.K.
Cirrus Logic Intl. Ltd.
Cirrus Logic UK
2901 Via Fortuna
Austin, Texas 78746
USA
T: (800) 888-5016
T: (512) 851-4000
F: (512) 851-4977
Cirrus Logic KK
20F., Ocean Building
80 Shanghai Street
Kowloon, Hong Kong, China
T 852-2376-0801
T 852-2314-9920
F 852-2375-1202
Girdler House
Quebec Road
Henley-on-Thames,
Oxfordshire RG9 1EY
United Kingdom
T: 44-1491-414-030
F: 44-1491-410-976
Aioi Sonpo, Bldg. 6F
5-6 Niban-cho, Chiyoda-ku
Tokyo, Japan 102-0084
T 81-3-5226-7390
F 81-3-5226-7677
W O R L D W I D E D I S T R I B U T I O N
Please access our website, www.cirrus.com/contacts, for your nearest local distributor.
© 2002, Cirrus Logic, Inc. All rights reserved. Cirrus, Cirrus Logic, MaverickKey, and Leading the Digital Entertainment Revolution are trademarks of Cirrus Logic, Inc. Other brand
and product names may be trademarks or service marks of their respective owners.
For more information, visit us at www.cirrus.com
0024-0902-PB
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