CS7808 datasheet(18/52 Pages) CIRRUS

18 / 52 page

CS7808

3. FUNCTIONAL DESCRIPTION

3.1

Block Diagram

The CS7808 block diagram is shown in Figure 14.

3.2

CS7808 Device Details

3.2.1

RISC-32 Processors

•

Two Powerful 32-bit RISC processors (RISC0 and

RISC1)

•

Virtual memory support

•

Optimizing C compiler

•

Big or little endian data formats support

•

MAC multiply/accumulate in 2 cycles with C support

•

4 Kbyte instruction cache, 2 Kbyte data cache

•

Single cycle instructions, runs at 81 Mhz

3.2.2

Powerful 32-Bit DSP

•

Powerful 32/24-bit DSP processor

•

24-bit fixed point logic, with 54-bit accumulator

•

Single-cycle throughput, 2-cycle latency multiply

accumulate, 34-bit simple integer logic

•

8-Kbyte instruction cache, 8-Kbyte program visible

local memory

•

Single cycle instructions, runs at 81 Mhz

3.2.3

System Controls

•

Includes several hardware lockable semaphore

registers

•

General-purpose register for inter-processor com-

munication

•

32-bit timers for I/O and other uses, with program-

mable interval rates

•

Both hardware and software interrupts on data or

debug

RISC0

(Navigation &

Control)

PLL (Main,

Audio, SDRAM)

MPEG2 Video

Decoder

2/4/8 Bit OSD

Video Processor

(I/O, Scale, PIP, Mix)

SubPicture

Decoder

RISC1

(Application)

AC '97

CODEC

Interface

PCM, SPDIF

Interface

AUDIO DSP

DMA Control

(BitBlt, CSS)

Mem Control

(SDRAM,ROM)

Host Interface

(ATAPI,AV,ISA)

External IO

(GPIO, IR)

Registers

I2C

(Debug Port)

Figure 14. CS7808 Block Diagram

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