WM8804 datasheet(38/66 Pages) WOLFSON

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WM8804

Production Data

PD Rev 4.1 September 2007

S/PDIF RECEIVER STATUS FLAGS

There are several S/PDIF receiver status flags which are recorded by the WM8804. The flags are

described in Table 45. These flags are available via GPIO pins or status registers.

FLAG

DESCRIPTION

VISIBILITY

UNLOCK

Unlock Flag

Indicates that the S/PDIF Rx clock recovery circuit is unlocked.

0 = Locked onto incoming S/PDIF stream.

1 = Not locked onto the incoming S/PDIF stream.

S/PDIF Status

GPO,

CSB –hardware mode

INVALID

Invalid Flag

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

0 = Data marked as valid

1 = Data marked as invalid

Interrupt Status Reg

TRANS_ERR

Transmission Error Flag

Indicates that a transmission error has occurred. This signal is asserted

when the preamble sequence is incorrectly received or there is a parity

error or a bi-phase mark encoding error.

0 = No error detected in transmission

1 = Error in transmission

Interrupt Status Reg,

GPO,

SCLK –hardware

mode

AUDIO_N

Audio Status Flag

Recovered Channel Status bit 1.

0 = Data word represents audio PCM samples.

1 = Data word does not represent audio PCM samples.

Channel Status

S/PDIF Status

PCM_N

Non-PCM Flag

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

ZEROFLAG

Zero Flag

Indicates detection of 1024 consecutive all zero frames

0 = 1024 consecutive all zero frames not detected

1 = 1024 consecutive all zero frames detected

GPO

CPY_N

Non-Copyright Flag

Recovered Channel Status bit 2.

0 = Copyright is asserted for this data.

1 = Copyright is not asserted for this data.

Note this signal is inverted and will cause an interrupt on logic 0.

Channel Status

S/PDIF Status

GPO

REC_FREQ[1:0]

Recovered Frequency Flag

Indicates recovered S/PDIF clock frequency:

00 = 192kHz

01 = 96kHz or 88.2kHz

10 = 48kHz or 44.1kHz

11 = 32kHz

S/PDIF Status

INT_N

Interrupt Signal

0 = Interrupt has occurred

1 = No interrupt has occurred

GPO

Recovered validity bit for current sub-frame

GPO

Recovered user bit for current sub-frame

GPO

Recovered channel status bit for current sub-frame

GPO

SFRM_CLK

Sub-frame clock.

1 = Current sub-frame is sub-frame A

0 = Current sub-frame is sub -frame B

GPO

192BLK

Start OF 192 Frame Sequence Flag

Indicates start of 192 frame block. Asserted duration of frame 0.

GPO

GEN_FLAG

General Error Flag

Logical OR of TRANS_ERR, NON_AUDIO and UNLOCK. Used only in

Hardware Control Mode

GPO0 - hardware

Mode

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