WM8580 datasheet(54/92 Pages) WOLFSON

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WM8580

Production Data

PD Rev 4.0 February 2007

An S/PDIF Block consists of 192 frames. Channel and User blocks are incorporated within the 192-

frame S/PDIF Block. For Consumer mode only the first 40-frames are used to make up the Channel

and User blocks. Figure 33 illustrates the S/PDIF format.

. . . . . . . . .

Frame

192

Frame

Subframe 1

Subframe 2

Sync

preamble

Aux

Audio Sample Word

3 4

7 8

27 28

32 bit

Word

Figure 33 S/PDIF Format

S/PDIF TRANSMITTER

The S/PDIF transmitter generates the S/PDIF frames, and outputs on the SPDIFOP pin. The audio

data for the frame can be taken from one of four sources, selectable using the TXSRC register. The

transmitter can be powered down using the SPDIFTXD register bit. The S/PDIF Transmitter can be

bypassed by setting the REAL_THROUGH register control bit. When set, the SPDIFOP pin sources

the output of the S/PDIF input mux.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

1:0

TXSRC[1:0]

S/PDIF Transmitter Data Source

00 = S/PDIF received data (see REAL_THROUGH)

01 = ADC digital output data.

10 = Secondary Audio Interface

11 = Audio Interface received data

OVWCHAN

Overwrite Channel Status

Only used if TXSRC=00. Overwrites the received

channel status data using data read from S/PDIF

transmitter channel status register

0 = Channel data equal to recovered channel data.

1 = Channel data taken from channel status registers.

R30

SPDTXCHAN 0

1Eh

REAL_

THROUGH

S/PDIF Through Mode Control

0 = SPDIFOP pin sources output of S/PDIF Transmitter

1 = SPDIFOP pins sources output of S/PDIF IN Mux

R51

PWRDN 2

33h

SPDIFTXD

S/PDIF Transmitter powerdown

0 = S/PDIF Transmitter enabled

1 = S/PDIF Transmitter disabled

Table 48 S/PDIF Transmitter Control

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

Parity bits).

Validity Bit

Set to 0 (to indicate valid data) – unless TXSRC=00 (S/PDIF receiver), where Validity is the value

recovered from the S/PDIF input stream by the S/PDIF receiver.

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.

WM8580 Datasheet(PDF) 54 Page - Wolfson Microelectronics plc

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