EP7312 Data Sheet
FEATURES
❑
ARM 720T Processor
— ARM7TDMI CPU Operating at Speeds of 74 and
90 MHz
— 8 kBytes of Four-way Set-associative Cache
— MMU with 64-entry TLB
— Thumb™ Code Support Enabled
❑
Ultra low power
— 90 mW at 74 MHz Typical
— 108 mW at 90 MHz Typical
— <.03 mW in the Standby State
❑
Advanced Audio Decoder/decompression Capability
— Supports bit streams with adaptive bit rates.
— Allows for support of multiple audio decompression
algorithms (MP3, WMA, AAC, Audible, etc.).
®
High-performance,
Low-power, System-on-chip
with SDRAM & Enhanced
Digital Audio Interface
OVERVIEW
The Cirrus Logic
™
EP7312 is designed for ultra-low-power
portable and line-powered applications such as portable
consumer entertainment devices, home and car audio juke box
systems, and general purpose industrial control applications, or
any device that features the added capability of digital audio
compression & decompression. The core-logic functionality of
the device is built around an ARM720T processor with
8 kBytes of four-way set-associative unified cache and a write
buffer. Incorporated into the ARM720T is an enhanced
memory management unit (MMU) which allows for support of
sophisticated operating systems like Microsoft
®
Windows
®
CE and Linux
®
.
(cont.)
(cont.)
BLOCK DIAGRAM
D ig ita l
A u d io
In te rfa c e
EPB Bus
C lo c k s &
T im e rs
SERIAL PORTS
S e ria l
In te rfa c e
P ow er
M anagem ent
ARM 720T
IC E -J T A G
A R M 7 T D M I C P U C o re
In te rru p ts,
P W M & G P IO
USER INTERFACE
(2) U A R T s
w / IrD A
8 KB
C ache
Boot
ROM
W rite
B u ffer
Bus
B rid g e
MMU
Keypad&
Touch
S c re e n I/F
In te rn a l D a ta B u s
M e m o ry C o n tro lle r
M a v eric k K e y
T M
SRAM I/F
SDRAM I/F
O n -c h ip S R A M
48 KB
LCD
C o n tro ller
MEMORY and STORAGE
©
Copyright Cirrus Logic, Inc. 2005
(All Rights Reserved)
AUG ‘05
DS508F1
CIRRUS [ CIRRUS LOGIC ]
