WM8580 datasheet(62/103 Pages) WOLFSON

62 / 103 page

WM8580

Production Data

PD Rev 4.5 February 2008

The WM8580 also transmits the preamble and VUCP bits (Validity, User Data, Channel Status and

Parity bits).

Validity Bit

By default, set to 0 (to indicate valid data) with the following exceptions:

TXSRC=00 (S/PDIF receiver), where Validity is the value recovered from the S/PDIF input

stream by the S/PDIF receiver.

TXVAL_OVWR=1, where Validity is the value set in registers TXVAL_SF0 and TXVAL_SF1.

User Data

Set to 0 as User Data configuration is not supported in the WM8580 – 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 –lock - transmitted at one 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 56 to

Table 60). 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

Linear PCM Identification

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 56 S/PDIF Transmitter Channel Status Bit Control 1

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