WM8804 datasheet(32/66 Pages) WOLFSON

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WM8804

Production Data

PD Rev 4.1 September 2007

CHANNEL STATUS

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

forms its own 192-frame block. The WM8804 is a consumer mode device and only the first 40 bits of

the block are used. All data transmitted from the WM8804 is stereo, so the channel status data is the

same for both channels. The only exception to this is the channel number bits [23:20] which can be

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

configured by setting the S/PDIF Transmitter Control registers (see Table 34 to Table 38). If TXSRC

is set to configure the S/PDIF receiver as the transmit data source, the channel status bits are

transmitted with the same values recovered by the receiver – unless TXSTATSRC is set, in which

case they are set by the S/PDIF Transmitter Control registers.

PARITY BIT

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

transmitter.

ADDRESS

BIT

LABEL

CHANNEL

STATUS

BIT

DEFAULT

DESCRIPTION

CON/PRO

Use Of Channel Status Block

0 = Consumer Mode

1 = Professional Mode (not supported by

WM8804).

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

Additional Format Information

000 = Data from Audio interface has no pre-

emphasis.

001 = Data from Audio interface has pre-

emphasis.

All other modes are reserved and should not

be used.

R18

SPDTX1

12h

7:6

CHSTMODE

[1:0]

7:6

Channel Status Mode

00 = Only valid mode for consumer

applications.

Table 34 S/PDIF Transmitter Channel Status Bit Control Register 1

ADDRESS

BIT

LABEL

CHANNEL

STATUS

BIT

DEFAULT

DESCRIPTION

R19

SPDTX2

13h

7:0

CATCODE

[7:0]

15:8

00000000

Category Code

Refer to S/PDIF specification (IEC 60958-3)

for full details.

0x00h indicates “general” mode.

Table 35 S/PDIF Transmitter Channel Status Bit Control Register 2

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