CS47048 datasheet(7/34 Pages) CIRRUS

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CS47048 Data Sheet

Audio SOC Processor Family

DS787A7

3. Code Overlays

The suite of software available for the CS47048 family consists of an operating system (OS) and a

library of overlays. The overlays for the CS47048 are currently limited to post-processors. All

software components are defined below:

1. OS/Kernel - Encompasses all non-audio processing tasks, including loading data from external

serial memory, processing host messages, calling audio-processing subroutines, error

concealment, etc.

2. Post-processors - Any module that processes audio I/O buffer PCM data. Examples are bass

management, audio manager, tone control, EQ, delay, customer-specific effects, and any post-

processing algorithms available for the CS485xx.

The bulk of standard overlays are stored in ROM within the CS47048, but a small image is required

to configure the overlays and boot the DSP. This small image can either be stored in an external

serial FLASH/EEPROM, or downloaded via a host controller through the SPI™/I2C® serial port.

The overlay structure reduces the time required to reconfigure the DSP when a processing change

is requested. Each overlay can be reloaded independently without disturbing the other overlays.

For example, when a different post-processor is selected, the OS, does not need to be reloaded —

only the new post-processor.

Table 2 lists the different configuration options available. Please refer to the CS47048 Firmware

User’s Manual for the latest listing of application codes and Cirrus Framework™ modules available.

Table 2. Device Selection Guide

Device

Suggested

Application

Channel Count

Input/Output

Package

CS47048-CQZ

CS47048-DQZ

Automotive Head Units

Automotive Outboard Amplifiers

Automotive Processors

Automotive Integration Hubs

Digital TV

MP3 Docking Stations

AVR

DVD Rx

DSP Controlled Speakers

Up to 12 Channels Analog In (4 simultaneously)

Up to 10 Channels PCM In (Stand-Alone)

Up to 8 Channels PCM In (w/ Host)

Up to 40 Channels TDM In

Up to 8 Channels Analog Out

Up to 8 Channels PCM Out

Up to 32 Channels TDM Out

100-pin

QFP

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