WM8581 datasheet(59/100 Pages) WOLFSON

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Production Data

WM8581

PD Rev 4.0 April 2007

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.

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

TXVAL_

OVWR

S/PDIF Transmitter Validity Overwrite Mode

0 = disabled, validity bit is 0 when transmitter sources

ADC, PAIF or SAIF, or is matches the S/PDIF input

validity when S/PDIF transmitter sources S/PDIF

receiver.

1 = enabled, validity bit transmitted for subframe 0 is

defined by TXVAL_SF0, validity bit transmitted for

subframe 1 is defined by TXVAL_SF1.

TXVAL_SF0

Overwrite Mode S/PDIF Transmitter Validity Sub-

Frame 0

0 = transmit validity = 0

1 = transmit validity = 1

R30

SPDTXCHAN 0

1Eh

TXVAL_SF1

Overwrite Mode S/PDIF Transmitter Validity Sub-

Frame 1

0 = transmit validity = 0

1 = transmit validity = 1

R51

PWRDN 2

33h

SPDIFTXD

S/PDIF Transmitter powerdown

0 = S/PDIF Transmitter enabled

1 = S/PDIF Transmitter disabled

Table 49 S/PDIF Transmitter Control

The WM8581 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

WM8581 Datasheet(PDF) 59 Page - Wolfson Microelectronics plc

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