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WM8777
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7
SPDIF_MODE
S/PDIF mode change.
0: Normal running
1: Change in S/PDIF frequency mode detected.
Recovered S/PDIF Channel status bit 0.
0 = Consumer Mode
1001100
(4Ch)
0
CON/PRO
S/PDIF
Receiver
Channel
Status
Register 1
(read-only)
1 = Professional Mode
The WM8777 is a consumer mode device. Detection of
professional mode may give erroneous behavior.
1
2
3
AUDIO_N
CPY_N
Recovered S/PDIF Channel status bit 1.
0 = Data word represents audio PCM samples.
1 = Data word does not represent audio PCM samples.
Recovered S/PDIF Channel status bit 2.
0 = Copyright is asserted for this data.
1 = Copyright is not asserted for this data.
Recovered S/PDIF Channel status bit 3.
0 = Recovered S/PDIF data has no pre-emphasis.
1 = Recovered S/PDIF data has pre-emphasis.
Recovered S/PDIF Channel status bits[5:4].
Reserved for additional de-emphasis modes.
Recovered S/PDIF Channel status bits[7:6].
00 = Only valid mode for consumer applications.
All other modes reserved.
DEEMPH
5:4
7:6
Reserved
CHSTMODE[1:0]
1001101
(4Dh)
7:0
CATCODE[7:0]
Recovered S/PDIF Channel status bits[15:8] - Category Code.
Refer to S/PDIF specification for details.
00h indicates “general” mode.
S/PDIF
Receiver
Channel
Status
Register 2
(read-only)
1001110
(4Eh)
3:0
7:4
SRCNUM[3:0]
CHNUM1[3:0]
Recovered S/PDIF Channel status bits[19:16] - Indicates number
of S/PDIF source.
Recovered S/PDIF Channel status bits[23:20] - Channel number
for channel 1.
S/PDIF
Receiver
Channel
Status
0000 = Take no account of channel number (channel 1 defaults to
left DAC)
Register 3
(read-only)
0001 = channel 1 to left channel
0010 = channel 1 to right channel
1001111
(4Fh)
3:0
5:4
FREQ[3:0]
Recovered S/PDIF Channel status bits[27:24] - Sampling
Frequency. See S/PDIF specification for details.
0001 = Sampling Frequency not indicated.
S/PDIF
Receiver
Channel
Status
Register 4
(read-only)
CLKACU[1:0]
Recovered S/PDIF Channel status bits[29:28] - Clock Accuracy of
received clock.
00 = Level II
01 = Level I
10 = Level III
11 = Interface frame rate not matched to sampling frequency.
1010000
(50h)
0
MAXPAIFRX_WL
Recovered S/PDIF Channel status bit[32] - Maximum Audio
sample word length
0 = 20 bits
1 = 24 bits
S/PDIF
Receiver
Channel
Status
Register 5
(read-only)
3:1
RXPAIFRX_WL
[2:0]
Recovered S/PDIF Channel status bits[35:33] - Audio Sample
Word Length
RXPAIFRX_WL
MAXPAIFRX_WL=
=1
MAXPAIFRX_WL=
=0
001
010
100
20 bits
22 bits
23 bits
16 bits
18 bits
19 bits
PP Rev 1.94 November 2004
93
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
