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CS4970X4 Datasheet(PDF) 6 Page - Cirrus Logic

Part No. CS4970X4
Description  32-bit High Definition Audio Decoder DSP Family
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS4970X4 Datasheet(HTML) 6 Page - Cirrus Logic

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Copyright 2008 Cirrus Logic
DS752PP7
CS4970x4 Data Sheet
32-bit High Definition Audio Decoder DSP Family
2.1 Migrating from the CS495xx(2) to the CS4970x4
The CS4970x4 was designed to provide an easy upgrade path from the CS495xx & CS4953x. Although 144-pin
versions of the two devices are virtually identical with respect to external system connection, 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 6-channel DSD input.
• The CS4970x4 adds support for TDM mode on both audio input and output ports.
• The CS4970x4 does not support external SRAM operation.
• The CS4970x4 external SDRAM bus speed is fixed at 150 MHz vs. the 120 MHz max bus speed for the
CS495xx. Some firmware modules also support a 75 MHz CS4970x4 SDRAM bus speed. Please 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. Please 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 called Decoders, Mid-processors, and Post-
processors. All software components are defined the following list:
• OS/Kernel - Encompasses all non-audio processing tasks, including loading data from external memory,
processing host messages, calling audio-processing subroutines, auto-detection, error concealment, etc.
• 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 require delivery of PCM or IEC61937-packed, compressed data via I2S-
or LJ-formatted digital audio to the CS4970x4 from A/D converters, SPDIF Rx, HDMI Rx, etc.
• 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 (n
2 channels) or Matrix Decoding (2 n channels). Examples are Dolby ProLogic IIx and
DTS Neo:6.
• 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 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).


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