WM8804 Datasheet, PDF (38/66 Pages) Wolfson Microelectronics plc – 1:1 Digital Interface Transceiver with PLL

WM8804
Production Data
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
UNLOCK
INVALID
TRANS_ERR
AUDIO_N
PCM_N
ZEROFLAG
CPY_N
REC_FREQ[1:0]
INT_N
V
U
C
SFRM_CLK
192BLK
GEN_FLAG
DESCRIPTION
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.
Invalid Flag
Indicates that recovered S/PDIF data is marked as invalid.
0 = Data marked as valid
1 = Data marked as invalid
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
Audio Status Flag
Recovered Channel Status bit 1.
0 = Data word represents audio PCM samples.
1 = Data word does not represent audio PCM samples.
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.
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
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.
Recovered Frequency Flag
Indicates recovered S/PDIF clock frequency:
00 = 192kHz
01 = 96kHz or 88.2kHz
10 = 48kHz or 44.1kHz
11 = 32kHz
Interrupt Signal
0 = Interrupt has occurred
1 = No interrupt has occurred
Recovered validity bit for current sub-frame
Recovered user bit for current sub-frame
Recovered channel status bit for current sub-frame
Sub-frame clock.
1 = Current sub-frame is sub-frame A
0 = Current sub-frame is sub -frame B
Start OF 192 Frame Sequence Flag
Indicates start of 192 frame block. Asserted duration of frame 0.
General Error Flag
Logical OR of TRANS_ERR, NON_AUDIO and UNLOCK. Used only in
Hardware Control Mode
VISIBILITY
S/PDIF Status
Register,
GPO,
CSB –hardware mode
Interrupt Status Reg
Interrupt Status Reg,
GPO,
SCLK –hardware
mode
Channel Status
Register,
S/PDIF Status
Register
S/PDIF Status
Register
GPO
Channel Status
Register,
S/PDIF Status
Register,
GPO
S/PDIF Status
Register
GPO
GPO
GPO
GPO
GPO
GPO
GPO0 - hardware
Mode
w
PD Rev 4.1 September 2007
38