Production Data
WM8580
STATUS FLAGS
There are several status flags generated by the S/PDIF Receiver, described below.
FLAG
DESCRIPTION
VISIBILITY
S/PDIF Status
Register, GPO
pins, SWMODE pin
(when in hardware
mode)
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.
INVALID
Indicates that recovered S/PDIF data is marked as invalid.
0 = Data marked as valid
Interrupt Status
Register
1 = Data marked as invalid
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
Interrupt Status
Register
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)
AUDIO_N
PCM_N
Linear PCM Identification
Channel Status
Register, S/PDIF
Status Register
0 = Data word represents audio PCM samples.
1 = Data word does not represent audio PCM samples.
Indicates that non-audio code (defined in IEC-61937) has been
detected.
S/PDIF Status
Register
0 = Sync code not detected.
1 = Sync code detected – received data is not audio PCM.
Recovered Channel Status bit-2 (active low)
0 = Copyright is asserted for this data.
CPY_N
DEEMPH
Channel Status
Register, S/PDIF
Status Register,
GPO pins
1 = Copyright is not asserted for this data.
Recovered Channel Status bit-3
Channel Status
Register, S/PDIF
Status Register,
GPO pins
0 = Recovered S/PDIF data has no pre-emphasis.
1 = Recovered S/PDIF data has pre-emphasis
REC_FREQ[1:0]
Indicates recovered S/PDIF sample rate.
00 = Invalid
S/PDIF Status
Register
01 = 96kHz / 88.2kHz
10 = 48kHz / 44.1kHz
11 = 32kHz
INT_N
Interrupt signal (see section Interrupt Generation)
Recovered validity-bit for current sub-frame
Recovered user-bit for current sub-frame
Recovered channel-bit for current sub-frame
Recovered parity-bit for current sub-frame
Indicates current sub-frame:
GPO pins
GPO pins
GPO pins
GPO pins
GPO pins
GPO pins
V
U
C
P
SFRM_CLK
1 = Sub-frame A
0 = Sub-frame B
192BLK
CSUD
Indicates start of 192 frame-block. High for duration of frame-0.
GPO pins
GPO pins
Indicates that the 192 frame-block of channel status data has
updated.
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
PD Rev 4.3 August 2007
63
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
