Production Data WM8804
w
PD Rev 4.1 September 2007
41
Where the INT_N has been asserted by an update signal (UPD_NON_AUDIO, UPD_CPY_N,
UPD_REC_FREQ, UPD_UNLOCK or UPD_DEEMPH) the S/PDIF Status Register (SPDSTAT) can
be interrogated to establish the updated value of the flag.
REGISTER
ADDRESS
BIT LABEL DEFAULT DESCRIPTION
0 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.
1 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.
2 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.
3 DEEMPH - De-emphasis Flag
Recovered Channel Status bit-3.
0 = Copyright is asserted for this data.
1 = Copyright is not asserted for this data.
5:4 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
R12
SPDSTAT
0Ch
(read-only)
6 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.
Table 49 S/PDIF Status Register
The interrupt and update signals used to generate INT_N can be masked at the users discretion. The
MASK register bit (Table 50) prevents flags from asserting INT_N and from updating the Interrupt
Status Register.
REGISTER
ADDRESS
BIT LABEL DEFAULT DESCRIPTION
R10
INTMASK
0Ah
7:0 MASK[7:0]
00000000
Interrupt Mask Enable
When a flag is masked, it does not update the Interrupt Status
Register or cause an INT_N interrupt to be asserted.
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_NON_AUDIO
MASK[5] = mask control for UPD_CPY_N
MASK[6] = mask control for UPD_DEEMPH
MASK[7] = mask control for UPD_REC_FREQ
Table 50 Interrupt Mask Control Register
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