Chapter 6. Digital Audio Output Interface; Introduction; Digital Audio Output Port Description; Dao Pin Description - Cirrus Logic CS485 Series User Manual

Introduction

CS485xx Hardware User's Manual
6.1 Introduction
The CS485xx Digital Audio Output port can provide up to 12 channels of PCM data (up to 32-bit resolution).
The Digital Audio Output port is implemented with a modified 3-wire Inter-IC Sound (I
an oversampling master clock (MCLK). The I
frequency (LRCLK), a bit clock for clocking the bits of the audio word (SCLK), and up to 6 audio data output
signals (DATA[5:0]). Each of the output data signals can be connected to the digital stereo input of an audio
digital-to-analog converter (DAC) for up to 12 channels of stereo PCM output.
The DAO port may slave to an externally generated SCLK and LRCLK or it may master these clocks if
MCLK is provided. The port supports data rates from 32 kHz to 192 kHz. One DAO pin can also be
configured to provide a 32-kHz to 192-kHz S/PDIF transmitter (XMTA) output.
6-3 illustrate the DAO block diagrams for the CS48560, CS48540 , and CS48520 products respectively.

6.2 Digital Audio Output Port Description

6.2.1 DAO Pin Description

Table 6-1 identifies the pins associated with the Digital Audio Output Port.
Pin Name
DAO_LRCLK
DAO_SCLK
DAO1_DATA0
DAO1_DATA1
DAO1_DATA2
DAO1_DATA3/XMTA
DAO2_DATA0
DAO2_DATA1
DAO_MCLK
6-1
2
S interface includes a frame clock at the current sampling

Table 6-1. Digital Audio Output (DAO) Pins

Pin Description
Sample Rate Clock
Bit Clock
Digital Audio Output
Digital Audio Output
Note: DAO1_DATA1 is not
available on CS48520
Digital Audio Output
Note: DAO1_DATA2 is not
available on CS48520
Digital Audio Output
Digital Audio Output
Digital Audio Output
Note: DAO2_DATA1 is not
available on CS48520 or
CS48540.
Master Clock
Copyright 2009 Cirrus Logic, Inc.
Digital Audio Output Interface
Figure
LQFP-48
Pin #
21
23
20
27
26
29
31
32
25
Chapter 6
2
S) interface along with
6-1, Figure 6-2, Figure
Pin
Type
I/O
I/O
Output
Output
Output
Output
Output
Output
I/O
DS734UM7