WM8581 datasheet(87/100 Pages) WOLFSON

87 / 100 page

Production Data

WM8581

PD Rev 4.0 April 2007

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

OVWCHAN

Only used if TXSRC==00. Overwrites the ‘through-path’ Channel

Bit with values determined by the channel-bit control registers.

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

TXVAL_SF1

Overwrite Mode S/PDIF Transmitter Validity Sub-Frame 1

0 = transmit validity = 0

1 = transmit validity = 1

CON/PRO

0 = Consumer Mode

1 = Professional Mode (not supported by WM8581)

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]

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]

00 = Only valid mode for consumer applications.

R32

SPDTXCHAN 2

20h

7:0

CATCODE

[7:0]

00000000

Category Code. Refer to S/PDIF specification for details.

00h indicates “general” mode

3:0

SRCNUM

[3:0]

0000

Source Number. No definitions are attached to data.

Channel Number for Subframe 1

CHNUM1

Channel Status Bits[21:20]

0000 = Do not use channel number

0001 = Send to Left Channel

0010 = Send to Right Channel

5:4

CHNUM1[1:0]

0000 = Do not use channel number

Channel Number for Subframe 2

CHNUM2

Channel Status Bits[23:22]

0000 = Do not use channel number

0001 = Send to Left Channel

0010 = Send to Right Channel

R33

SPDTXCHAN 3

21h

7:6

CHNUM2[1:0]

0000 = Do not use channel number

R34

SPDTXCHAN 4

3:0

FREQ[3:0]

0001

Sampling Frequency. See S/PDIF specification for details.

0001 = Sampling Frequency not indicated.

WM8581 Datasheet(PDF) 87 Page - Wolfson Microelectronics plc

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