CS4970x4 Data Sheet

32-bit High Definition Audio Decoder DSP Family

DS752F1

5

2.1 Migrating from CS495xx(3) to CS4970x4

CS4970x4 was designed to provide an easy upgrade path from the CS495xx and CS4953x. There are some

small differences the hardware designer should be aware of:

• The PLL supply voltage on the CS4970x4 is 3.3V vs. 1.8V on the CS495xx.

• The PLL filter topology is simpler when using the CS4970x4 rather than the CS495xx.

• The CS4970x4 adds support for Time-division multiplexing (TDM) mode on both audio input and output

ports.

• The CS4970x4 does not support external static random access memory (SRAM) operation.

• The CS4970x4 external Synchronous dynamic random access memory (SDRAM) bus speed is fixed at

150 MHz vs. the 120 MHz maximum bus speed for the CS495xx. Some firmware modules also support a

75 MHz CS4970x4 SDRAM bus speed. Refer to AN304 for details.

• The CS4970x4 CLKOUT pin can output XTALI or XTALI/2. The CS495xx can only output XTALI.

2.2 Licensing

Licenses are required for all of the third party audio decoding/processing algorithms listed below, including the

application notes. Contact your local Cirrus Sales representative for more information.

3 Code Overlays

The suite of software available for the CS4970x4 family consists of operating systems (OS) and a library of

overlays. The overlays have been divided into three main groups: decoders, matrix processors, and

postprocessors. All software components are defined in the following list:

Table 2. Device and Firmware Selection Guide

Device

Decode Processor

Matrix Processor Module

1. Additional processing (MPMA, MPMB/VPM, PPM) post any of the HD audio decoders may be limited. Contact your Cirrus Logic

FAE for the latest concurrency matrix.

Virtualizer Processor

Module

Post Processor

Module

CS497014

300MACS

Stereo PCM

(4:1/2:1 Down-sampling and

Multichannel PCM

(4:1/2:1 Down-sampling and

Dolby Digital

MPEG-2 AAC LC 5.1

Dolby Digital Plus

2. Downsampling and Upsampling functionality is located in the operating system. The Cirrus Decimator (Down-Sampler) is also

available as a separate post-processing module that is described in the application note AN288PPI.

3. The indicated HD audio decoder algorithms require external SDRAM. Consult your Cirrus Logic FAE for the recommended

SDRAM size for your design.

Dolby Pro Logic II / IIx / IIz 7.1

SRS Circle Surround II / Circle

Surround Auto / Circle

Surround Decoder Optimized

(Stereo In)

Cirrus Original Multi-Channel

Surround 2 (Effects / Reverb

Processor)

Crossbar (Down-mix / Up-mix)

(Simultaneous Process)

Cirrus Virtualizer

Technology

Dolby Headphone 2

Dolby Virtual Speaker 2

SRS CS Headphone

SRS TruSurround HD/HD4

APP

(Advanced Post-

processing)

–Tone Control

–Select 2

–PEQ (up to 11 Bands)

–Delay

(Speaker to Listening

Position Alignment

and/or Lip Sync)

–7.1 Bass Manager

–Audio Manager

SRS TruVolume 7.1

Multichannel

Dolby Volume

Multichannel

CS497004

300MACS

CS497024

300MACS

Same as CS497014 +

DTS, DTS-ES, DTS96/24

DTS-HD Master Audio3

DTS-HD High Res Audio3

DTS Express 5.1

Same as CS497014 +

DTS Neo:6, DTS Neural

Surround