WM8581 datasheet(82/94 Pages) WOLFSON

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WM8581

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PP Rev 1.0 March 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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.

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[23:20]

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[23:20]

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

3:0

FREQ[3:0]

0001

Sampling Frequency. See S/PDIF specification for details.

0001 = Sampling Frequency not indicated.

R34

SPDTXCHAN 4

22h

5:4

CLKACU[1:0]

Clock Accuracy of Generated clock.

00 = Level II

01 = Level I

10 = Level III

11 = Interface frame rate not matched to sampling frequency.

MAXWL

Maximum Audio sample word length

0 = 20 bits

1 = 24 bits

Audio Sample Word Length.

000 = Word Length Not Indicated

TXWL[2:0]

MAXWL==1

MAXWL==

001

20 bits

16 bits

010

22 bits

18 bits

100

23 bits

19 bits

101

24 bits

20 bits

110

21 bits

17 bits

3:1

TXWL[2:0]

101

All other combinations reserved

R35

SPDTXCHAN 5

23h

7:4

ORGSAMP

[3:0]

0000

Original Sampling Frequency. See S/PDIF specification for details.

0000 = original sampling frequency not indicated

R36

SPDMODE

24h

SPDIFIN1MODE

Selects the input circuit type for the SPDIFIN1 input

0 = CMOS-compatible input

1 = Comparator input. Compatible with 500mVpp AC coupled

consumer S/PDIF input signals as defined in IEC-60958-3.

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