CS47048 Data Sheet

Audio SOC Processor Family

8

Copyright 2008 Cirrus Logic

DS787A7

4. Hardware Functional Description

The CS47048 is a true system-on-a-chip that combines a powerful 32-bit DSP engine with

analog/digital audio inputs and analog/digital audio outputs. It can be integrated into a complex

multi-DSP processing system, or stand alone in an audio product that requires analog-in and

analog-out. A top level block diagram is shown below in Figure 1.

4.1 DSP Core

The CS47048 is a single-core DSP with separate X and Y data and P code memory spaces. The

DSP core is a high-performance, 32-bit, user-programmable, fixed-point DSP that is capable of

performing two multiply-and-accumulate (MAC) operations per clock cycle. The DSP core has

eight 72-bit accumulators, four X-data and four Y-data registers, and 12 index registers.

The DSP core is coupled to a flexible 8-channel DMA engine. The DMA engine can move data

between peripherals such as the serial control port (SCP), digital audio input (DAI) and digital audio

output (DAO), sample rate converters (SRC), analog-to-digital converters (ADC), digital-to-analog

converters (DAC), or any DSP core memory, all without the intervention of the DSP. The DMA

engine off-loads data move instructions from the DSP core, leaving more MIPS available for signal

processing instructions.

x8

x4

x2

x2

DAC0

text

Coyote32

32-bit DSP

DMA

SPI / I

Control

I

TDM

ADC0/1

I

I

SPDIF

PLL

ROM

S

R

C

2

Clock

Manager

Timers

RAM

GPIO

DAC1

DAC2

DAC3

DAC4

DAC5

DAC6

DAC7

S

R

C

1

ROM

RAM

ROM

RAM

P

Y

32K x 32-bit SRAM with three 2K blocks

Assignable to Program or Y Data memory

I

TDM /

SPDIF

Stereo Inputs

On Analog in

ADC2/3

DBC

(I

PIC

ADC’s & DAC’s operate

in Single ended or

Differential mode

S

R

C

3

8ch

8ch

SRC3 has 8

independent Channels

for In or Out

4ch