CS495313-CVZ(2008) Ver la hoja de datos (PDF) - Cirrus Logic

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CS495313-CVZ
(Rev.:2008)

32-bit Audio Decoder DSP Family with Dual DSP Engine Technology

Cirrus Logic 

CS4953xx Data Sheet

32-bit Audio Decoder DSP Family

3. Code Overlays

The suite of software available for the CS4953xx family consists of an operating system (OS) and a library of

overlays. The overlays have been divided into three main groups called Decoders, Mid-processors, and Post-

processors. All software components are defined below:

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

processing host messages, calling audio-processing subroutines, error concealment, etc.

2. Decoders - Any Module that initially writes data into the audio I/O buffers, e.g. AC-3®, DTS, PCM, etc. All the

decoding/processing algorithms listed below require delivery of PCM or IEC61937-packed, compressed data

via I2S- or LJ-formatted digital audio to the CS4953xx.

3. Mid-processors - Any module that processes audio I/O buffer PCM data in-place before the Post-

processors. Generally speaking, these modules alter the number of valid channels in the audio I/O buffer

through processes like Virtualization (nÖ2 channels) or Matrix Decoding (2Ön channels). Examples are Dolby

ProLogic IIx and DTS Neo:6.

4. Post-processors - Any module that processes audio I/O buffer PCM data in-place after the Mid-Processors.

Examples are Bass Management, Audio Manager, Tone Control, EQ, Delay, Customer-specific Effects, Dolby

Headphone/Virtual Speaker, etc.

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

Y requested. Each overlay can be reloaded independently without disturbing the other overlays. For example,

when a new decoder is selected, the OS, mid-, and post-processors do not need to be reloaded — only the

new decoder (the same is true for the other overlays).

R Table 2 below lists the firmware available based on device selection. Please refer AN288 CS4953xx Firmware

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

DS705PP3

Copyright 2008 Cirrus Logic

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