CS4923 datasheet(20/56 Pages) CIRRUS

20 / 56 page

CS4923/4/5/6/7/8/9

DS262F2

FAMILY OVERVIEW

The CS4923, CS4924, CS4925, CS4926, CS4927,

CS4928 and the CS4929 are system on a chip

solutions for multi-channel (or stereo in the case of

the CS4929) audio decompression and digital

signal processing. Because the parts are primarily

RAM-based, a download of application software is

required each time the CS4923/4/5/6/7/8/9 is

powered up. This document uses “download” and

“code load” interchangeably. These terms should

interpreted

meaning

the

transfer

application

code

into

the

internal

CS4923/4/5/6/7/8/9

memory

from

either

external microcontroller or through the autoboot

procedure.

This document focuses on the electrical features

and characteristics of these parts. The different

features are described from a hardware design

perspective. It should be understood that not all of

the features portrayed in this document are

supported by all of the versions of application code

available. The application user’s guides (see

section 2.2.2) should be consulted to confirm

which hardware features are supported by the

software. This document will be valuable to both

the hardware designer and the system programmer.

This data sheet covers the CS4923, CS4924,

CS4925, CS4926, CS4927, CS4928 and CS4929.

These parts are identical from an external electrical

perspective. Internally each device has been

tailored

for

supporting

different

decoding

standards. For this document CS4923/4/5/6/7/8/9

has been replaced in certain places with CS492X

for

readability.

Unless

otherwise

specified

CS492X should be interpreted as applying to the

CS4923, CS4924, CS4925, CS4926, CS4927,

CS4928 and CS4929.

There are two revisions of silicon commercially

available. The features available on Revision D are

a super-set of those features available on Revision

B. Differences between the revisions are pointed

out when features are discussed within this

document. The silicon revision for any chip can be

determined by referencing Table 1 below.

These parts are generally targeted at two different

market segments. The broadcast market where

audio/video (A/V) synchronization is required, and

the outboard decoder markets where audio/video

synchronization is not required. The important

differentiation is the format in which the data will

be received by the CS4923/4/5/6/7/8/9. In systems

where A/V synchronization is required from the

CS4923/4/5/6/7/8/9, the incoming data is typically

PES encoded. In an outboard decoder application

the data typically comes in the IEC61937 format

(as specified by the DVD consortium). An

important

point

remember

that

the

CS4923/4/5/6/7/8/9

will

support

both

environments, but different downloads are required

depending on the input data type.

Broadcast applications include (but are not limited

to) set top box applications, DVDs and digital TVs.

Outboard decoder applications include standalone

decoders and audio/video receivers. Often times a

system may be a hybrid between an outboard

decoder and a broadcast system depending on its

functionality.

As discussed above, compressed audio can be

packed in IEC61937, PES, or elementary formats

depending on the decoder environment. Each for-

mat is supported by a separate download of appli-

cation code. Consult the relevant Application Code

Revision B

Revision D

CS492301

CS492305

CS492401

CS492405

CS492501

CS492505

CS492603

CS492604

CS492705

CS492804

CS492906

Table 1. Silicon Revisions

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