WM8580 datasheet(55/92 Pages) WOLFSON

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Production Data

WM8580

PD Rev 4.0 February 2007

Channel Status

The Channel Status bits form a 192-frame block - transmitted at 1 bit per sub-frame. Each sub-frame

forms its own 192-frame block. The WM8580 is a consumer mode device and only the first 40 bits of

the block are used. All data transmitted from the WM8580 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 49 to Table 53). 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

WM8580)

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 49 S/PDIF Transmitter Channel 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 50 S/PDIF Transmitter Channel Bit Control 2

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