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?.

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.).

48 KBytes of On-chip SRAM

MaverickKey? IDs

— 32-bit unique ID can be used for DRM-compliant 128-

bit random ID.

Available in 74 and 90 MHz clock speeds.

LCD controller

— Interfaces directly to a single-scan panel monochrome

STN LCD.

— Interfaces to a single-scan panel color STN LCD with

minimal external glue logic.

Full JTAG Boundary Scan and Embedded ICE? Support

Integrated Peripheral Interfaces

— 32-bit SDRAM Interface, Up to 2 External Banks

— 8/32/16-bit SRAM/FLASH/ROM Interface

— Digital Audio Interface provides glueless interface to

low-power DACs, ADCs, and CODECs.

— Two Synchronous Serial Interfaces (SSI1, SSI2)

— CODEC Sound Interface

— 8 x 8 Keypad Scanner

— 27 General-purpose Input/Output Pins

— Dedicated LED Flasher Pin from the RTC

Internal Peripherals

— Two 16550-compatible UARTs

— IrDA Interface

— Two PWM Interfaces

— Real-time Clock

— Two General-purpose 16-bit Timers

— Interrupt Controller

— Boot ROM

Package

— 208-Pin LQFP

— 256-Ball PBGA

The fully static EP7312 is optimized for low power

dissipation and is fabricated using a 0.25 micron CMOS

process.