WM8580 datasheet(64/92 Pages) WOLFSON

64 / 92 page

WM8580

Production Data

PD Rev 4.0 February 2007

ERROR HANDLING

Should a TRANS_ERR or INVALID flag be asserted, it is assumed the recovered S/PDIF sub-frame

is corrupted or invalid. If either flag is masked using the mask register, the WM8580 will overwrite the

recovered frame (i.e. both sub-frames) with either all-zeros or the last valid data sample; depending

on how FILLMODE has been set. If both flags are unmasked, data is not modified and the user must

handle corrupted data appropriately.

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 65.

0 = Use INVALID flag.

1 = Ignore INVALID flag.

Table 64 S/PDIF Receiver Error Handling Registers

MASK

ALWAYSVALID

DATA OVERWRITE

INTB ASSERT

Yes

Table 65 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 WM8580 has ten pins which can be configured as GPOs using the registers shown in Table 66.

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 54.

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