EP7212 datasheet(3/136 Pages) CIRRUS

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EP7212

Low-Power System-on-Chip with LCD Controller and Digital Audio Interface

DS474PP1

OVERVIEW (cont.)

all system cost. The on-chip boot ROM can be used

in product manufacturing to serially download system

code into system FLASH memory. To further mini-

mize system memory requirements and cost, the

ARM Thumb instruction set is supported, providing

for the use of high-speed 32-bit operations in 16-bit

op-codes and yielding industry-leading code density.

The second is the programmable 16- or 32-bit-wide

DRAM interface that allows direct connection of up to

two banks of DRAM, each bank containing up to 256

Mbytes. To assure the lowest possible power con-

sumption, the EP7212 supports self-refresh DRAMs,

which are placed in a low-power state by the device

when it enters the low-power Standby State. EDO

and Fast Page DRAM are supported.

A DMA address generator is also provided that

fetches video display data for the LCD controller from

main DRAM 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 DRAMs.

Digital Audio Capability

The EP7212 uses its powerful 32-bit RISC process-

ing engine to implement audio decompression algo-

rithms 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 EP7212.

Serial Interfaces

The EP7212 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 kbps. An

IrDA SIR protocol encoder / decoder can be option-

ally switched into the RX / TX signals to / from one of

the UARTs to enable these signals to drive an infrared

communication interface directly.

Digital Audio Interface (DAI)

The EP7212 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 Crystal CS43L41 / 42 / 43 low-

power audio DACs and the Crystal CS53L32 low-

power ADC. Some of these devices feature digital

bass and treble boost, digital volume control and

compressor-limiter functions.

Packaging

The EP7212 is available in a 208-pin LQFP package

and a 256-ball PBGA package.

System Design

As shown in system block diagram, simply adding

desired memory and peripherals to the highly

integrated EP7212 completes a low-power system

solution. All necessary interface logic is integrated

on-chip.

EP7212 Datasheet(PDF) 3 Page - Cirrus Logic

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