WM8804 datasheet(19/66 Pages) WOLFSON

19 / 66 page

Production Data

WM8804

PD Rev 4.1 September 2007

DIGITAL ROUTING CONTROL

See page 20 for a full description of the signal routing options available in the WM8804. In Software

control mode the value set in register TXSRC determines the S/PDIF transmitter data source. In

hardware control mode the value of TXSRC can be set using the CSB pin.

(HARDWARE

MODE)

(SOFTWARE

MODE)

CSB

TXSRC

S/PDIF Rx

AIF Rx

Table 15 S/PDIF Transmitter Digital Routing Control Configuration

AUDIO INTERFACE CONTROL

In software control mode the audio data word length and audio data format can be set independently

for the receiver and transmitter sides of the interface. However, in hardware control mode both sides

of the interface are combined and the configuration is set using SDOUT and GPO0 pins as described

in Table 6 and Table 16. Note that AIF_CONF[1:0] configures the audio interface when the device

operates in hardware mode.

GPO0 /

AIFCONF[1]

SDOUT /

AIFCONF[0]

DESCRIPTION

16-bit I2S

24-bit I2S

24-bit Left Justified With Flags

16-bit Right Justified

Table 16 Digital Audio Interface Control in Hardware Control Mode

STATUS INFORMATION

In hardware control mode the WM8804 outputs a selection of status flags for the user. Table 17

describes the flags which are available and the output pins on which they are available.

STATUS FLAG

SCLK

TRANS_ERR

SDOUT

NON_AUDIO

CSB

UNLOCK

GPO0

GEN_FLAG

Table 17 Hardware Control Mode Status Flag Configuration

A full description of the status flags is given in Table 45.

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