WM8581 datasheet(64/94 Pages) WOLFSON

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WM8581

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PP Rev 1.0 March 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AUDIO_N

Recovered Channel Status bit-1.

0 = Data word represents audio PCM samples.

1 = Data word does not represent audio PCM samples.

PCM_N

Indicates that non-audio code (defined in IEC-61937)

has been detected.

0 = Sync code not detected.

1 = Sync code detected – received data is not audio

PCM.

CPY_N

Recovered Channel Status bit-2 (active low).

0 = Copyright is asserted for this data.

1 = Copyright is not asserted for this data.

DEEMPH

Recovered Channel Status bit-3

0 = Recovered S/PDIF data has no pre-emphasis.

1 = Recovered S/PDIF data has pre-emphasis

5:4

REC_FREQ

[1:0]

Indicates recovered S/PDIF clock frequency:

00 = 192kHz

01 = 96kHz / 88.2kHz

10 = 48kHz / 44.1kHz

11 = 32kHz

R49

SPDSTAT

31h

(read-only)

UNLOCK

Indicates that the S/PDIF Clock Recovery circuit is

unlocked or that the input S/PDIF signal is not present.

0 = Locked onto incoming S/PDIF stream.

1 = Not locked to the incoming S/PDIF stream or the

incoming S/PDIF stream is not present.

Table 61 S/PDIF Status Register

The interrupt and update signals used to generate INTB can be masked as necessary. The MASK

Masked flags update the S/PDIF Status Register (R49).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R37

INTMASK

25h

8:0

MASK[8:0]

000000000

When a flag is masked, it does not update the Interrupt

Status Register or assert INTB.

0 = unmask, 1 = mask.

MASK[0] = mask control for UPD_UNLOCK

MASK[1] = mask control for INT_INVALID

MASK[2] = mask control for INT_CSUD

MASK[3] = mask control for INT_TRANS_ERR

MASK[4] = mask control for UPD_AUDIO_N

MASK[5] = mask control for UPD_PCM_N

MASK[6] = mask control for UPD_CPY_N

MASK[7] = mask control for UPD_DEEMPH

MASK[8] = mask control for UPD_REC_FREQ

Table 62 Interrupt Mask Control Register

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 WM8581 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.

WM8581 Datasheet(PDF) 64 Page - Wolfson Microelectronics plc

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