WM8581 datasheet(65/94 Pages) WOLFSON

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WM8581

PP Rev 1.0 March 2006

ALWAYSVALID must be set to 0, else the INVALID flag will be ignored. For the S/PDIF Receiver to

S/PDIF transmitter path, only masked INVALID flags will cause data to be overwritten – TRANS_ERR

flags have no effect.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R38

GPO1

26h

FILLMODE

Determines what S/PDIF Receiver should do with

corrupted or invalid data:

0 = Data from S/PDIF Receiver remains static at last

valid sample.

1 = Data from S/PDIF Receiver is output as all zeros.

R39

GPO2

27h

ALWAYSVALID

Used to ignore the INVALID flag. See Table 64.

0 = Use INVALID flag.

1 = Ignore INVALID flag.

Table 63 S/PDIF Receiver Error Handling Registers

MASK

ALWAYSVALID

DATA OVERWRITE

INTB ASSERT

Yes

Table 64 Data Overwrite / INTB Assert Criteria

NON-AUDIO DETECTION

Non-Audio data is indicated by the AUDIO_N and PCM_N flags. AUDIO_N is recovered from the

Channel Status block. PCM_N is set on detection of the 96-bit IEC-61937 non-audio data sync code,

embedded in the data section of the S/PDIF frame. If DAC1 is sourcing the S/PDIF Receiver and

either the AUDIO_N or PCM_N flags are asserted, DAC1 is automatically muted using the softmute

feature. As described above, any change of AUDIO_N or PCM_N status will cause an INTB interrupt

(UPD_NON_AUDIO) to be generated. If the MASK register bit for AUDIO_N or PCM_N is set, then

the associated signal will not generate an interrupt (UPD_NON_AUDIO) but the DAC will be muted.

S/PDIF INPUT/ GPO PIN CONFIGURATION

The WM8581 has seven pins which can be configured as GPOs using the registers shown in Table 65. The

GPO pins can be used to output status data decoded by the S/PDIF receiver. These same pins may be used

as S/PDIF inputs as described in Table 53.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

3:0

GPO1OP[3:0]

0000

R38

GPO1

26h

7:4

GPO2OP[3:0]

0001

3:0

GPO3OP[3:0]

0010

R39

GPO2

27h

7:4

GPO4OP[3:0]

0011

3:0

GPO5OP[3:0]

0100

R40

GPO3

28h

7:4

GPO6OP[3:0]

0101

0000 = INTB

0001 = V

0010 = U

0011 = C

0100 = P

0101 = SFRM_CLK

0110 = 192BLK

0111 = UNLOCK

1000 = CSUD

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