Cirrus Logic CS4970x4 - Manual (Page 67)

Introduction
CS4953x4/CS4970x4 System Designer’s Guide
DS810UM6 Copyright 2013 Cirrus Logic, Inc 3-1
Chapter 3
Audio Input Interfaces
3.1 Introduction
CS4953x4/CS4970x4 support a wide variety of audio data formats through various input and output ports.
Hardware availability is entirely dependent on whether the software application code being used supports
the required mode. This data sheet presents most of the modes available with the CS4953x4/CS4970x4
hardware. However, not all of the modes are available with any particular piece of application code. The
Application Note that serves as the User’s Guide for the particular code being used should be consulted
when determining if a particular mode is supported. In addition, if a particular mode is desired that is not
presented here or in the Cirrus Logic firmware application note, please contact your sales representative
regarding its availability.
3.2 Digital Audio Input Port Description
The CS4953x4/CS4970x4 Digital Audio Input ports (DAI1 and DAI2) are designed to provide five digital
audio input pins (10 channels total) that can be configured to load audio samples in a number of formats,
or accept multiple stereo channels on a single input port.
DAI features include:
• Five digital audio input pins capable of supporting many audio formats
• Two independent input clock domains (DAI1_SCLK/DAI1_LRCLK or DAI2_SCLK/DAI2_LRCLK)
• Up to 32-bit data widths
• Sample rates up to 192 KHz
• Two simultaneous serial compressed audio data inputs in IEC61937 format for dual-decode support
• 2, 4, or 6 channels on a single pin (DAI_DATAx)
• Simultaneous 8-channel PCM for multichannel DVD audio and compressed audio
3.2.1 DAI Pin Description
The digital audio input port (DAI) on CS4953x4/CS4970x4, is used for both compressed and PCM digital
audio data input.
Table 3-1 shows the mnemonic and pin description of the pins associated with the DAI
port on the CS4953x4/CS4970x4.
Table 3-1. Digital Audio Input Port
Pin Name Pin Description
LQFP-144
Pin #
LQFP-128
Pin #
Pin Type
DAI1_LRCLK
Sample Rate Clock 1 PCM Audio Input Sample
Rate (LeftRight) Clock
DAI1_LRCLK is the sample rate input clock for
the serial PCM audio data on DAI_DATA[3:0].
138 30 Input
DAI1_SCLK
Bit Clock 1 PCM Audio Input Bit Clock
DAI1_SCLK is the bit clock input for the serial
PCM audio data on DAI_DATA[3:0]..
137 29 Input