WM8580 datasheet(63/97 Pages) WOLFSON

63 / 97 page

Production Data

WM8580

PD Rev 4.3 August 2007

STATUS FLAGS

There are several status flags generated by the S/PDIF Receiver, described below.

FLAG

DESCRIPTION

VISIBILITY

UNLOCK

Indicates that the S/PDIF Clock Recovery circuit is unlocked, or the

incoming S/PDIF signal is not present.

0 = Locked onto incoming S/PDIF stream.

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

is not present.

S/PDIF Status

pins, SWMODE pin

(when in hardware

mode)

INVALID

Indicates that recovered S/PDIF data is marked as invalid.

0 = Data marked as valid

1 = Data marked as invalid

Interrupt Status

TRANS_ERR

Indicates that recovered S/PDIF frame has parity errors or bi-phase

encoding errors, or that sub-frames were recovered out of

sequence

0 = No data errors or bi-phase encoding errors detected and sub-

frame sequence correct

1 = Data errors or bi-phase encoding errors detected or subframe

sequence incorrect (missing preamble)

Interrupt Status

AUDIO_N

Linear PCM Identification

0 = Data word represents audio PCM samples.

1 = Data word does not represent audio PCM samples.

Channel Status

Status Register

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.

S/PDIF Status

CPY_N

Recovered Channel Status bit-2 (active low)

0 = Copyright is asserted for this data.

1 = Copyright is not asserted for this data.

Channel Status

Status Register,

GPO pins

DEEMPH

Recovered Channel Status bit-3

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

1 = Recovered S/PDIF data has pre-emphasis

Channel Status

Status Register,

GPO pins

REC_FREQ[1:0]

Indicates recovered S/PDIF sample rate.

00 = Invalid

01 = 96kHz / 88.2kHz

10 = 48kHz / 44.1kHz

11 = 32kHz

S/PDIF Status

INT_N

Interrupt signal (see section Interrupt Generation)

GPO pins

Recovered validity-bit for current sub-frame

GPO pins

Recovered user-bit for current sub-frame

GPO pins

Recovered channel-bit for current sub-frame

GPO pins

Recovered parity-bit for current sub-frame

GPO pins

SFRM_CLK

Indicates current sub-frame:

1 = Sub-frame A

0 = Sub-frame B

GPO pins

192BLK

Indicates start of 192 frame-block. High for duration of frame-0.

GPO pins

CSUD

Indicates that the 192 frame-block of channel status data has

updated.

GPO pins

ZFLAG

Indicates ‘zero-detection’ in DACs. See page 45 for more details

MUTE pin, GPO

pins

NON_AUDIO

Logical OR of PCM_N and AUDIO_N

GPO pins, SDO pin

(when in hardware

mode)

Table 61 Status Flag Description

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