EP7312 Data Sheet
FEATURES
I
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
I
Ultra low power
— 90 mW at 74 MHz typical
— 108 mW at 90 MHz typical
— <.03 mW in the Standby State
I
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 and 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 terfa ce
E PB B us
C lo c ks &
T im ers
SERIAL PORTS
S erial
In terfa ce
P o w er
M an ag em e n t
ARM720T
IC E -J T A G
A R M 7T D M I C P U C o re
In terru p ts ,
P W M & G P IO
USER INTERFACE
(2) U A R T s
w / IrD A
8 KB
C ache
B oo t
ROM
W rite
B u ffe r
B us
B rid g e
MMU
K e yp ad &
T o u ch
S cre en I/F
In tern al D a ta B u s
M em o ry C o n tro lle r
M a ve ric kK e y
T M
S RAM I/F
S DRAM I/F
O n -c h ip S R A M
48 K B
LCD
C o n tro lle r
MEMORY and STORAGE
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2003
(All Rights Reserved)
©
Nov ’03
DS508PP5
CIRRUS [ CIRRUS LOGIC ]
