WM8581 datasheet(60/100 Pages) WOLFSON

60 / 100 page

WM8581

Production Data

PD Rev 4.0 April 2007

Set to 0 as User Data configuration is not supported in the WM8581 – if TXSRC=00 (S/PDIF

receiver) User Data is the value recovered from the S/PDIF input stream by the S/PDIF receiver.

Channel Status

The Channel Status bits form a 192-frame block - transmitted at one bit per sub-frame. Each sub-

frame forms its own 192-frame block. The WM8581 is a consumer mode device and only the first 40

bits of the block are used. All data transmitted from the WM8581 is stereo, so the channel status data

is duplicated for both channels. The only exception to this is the channel number bits (23:20) which

can be changed to indicate whether the channel is left or right in the stereo image. Bits within this

block can be configured by setting the Channel Status Bit Control registers (see Table 50 to Table

54). If TXSRC=00 (S/PDIF receiver), the Channel Status bits are transmitted with the same values

recovered by the receiver – unless OVWCHAN is set, in which case they are set by the S/PDIF

transmitter channel status registers.

Parity Bit

This bit maintains even parity for data as a means of basic error detection. It is generated by the

transmitter.

For further details of all channel status bits, refer to IEC-60958-3.

ADDRESS

BIT

LABEL

CHANNEL

STATUS

BIT

DEFAULT

DESCRIPTION

CON/PRO

0 = Consumer Mode

1 = Professional Mode (not supported by

WM8581)

AUDIO_N

0 = S/PDIF transmitted data is audio PCM.

1 = S/PDIF transmitted data is not audio

PCM.

CPY_N

0 = Transmitted data has copyright asserted.

1 = Transmitted data has no copyright

assertion.

5:3

DEEMPH[2:0]

5:3

000

000 = Data from Audio interface has no pre-

emphasis.

001 = Data from Audio interface has pre-

emphasis.

010 = Reserved (Audio interface has pre-

emphasis).

011 = Reserved (Audio interface has pre-

emphasis).

All other modes are reserved and should not

be used.

R31

SPDTXCHAN 1

1Fh

7:6

CHSTMODE

[1:0]

7:6

00 = Only valid mode for consumer

applications.

Table 50 S/PDIF Transmitter Channel Status Bit Control 1

ADDRESS

BIT

LABEL

CHANNEL

STATUS

BIT

DEFAULT

DESCRIPTION

R32

SPDTXCHAN 2

20h

7:0

CATCODE

[7:0]

15:8

00000000

Category Code. Refer to S/PDIF

specification IEC60958-3 for details.

00h indicates “general” mode.

Table 51 S/PDIF Transmitter Channel Status Bit Control 2

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