WM8777
Product Preview
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0111000
(38h)
1:0
3:2
5:4
DAC1SEL[1:0]
DAC2SEL[1:0]
DAC3SEL[1:0]
00
01
10
DAC digital input select.
00 = DAC takes data from PDATAIP1
01 = DAC takes data from PDATAIP2
10 = DAC takes data from PDATAIP3
11 = DAC takes data from PDATAIP4
0 = Consumer Mode
DAC Digital
Input Selector
7:6
DAC4SEL[1:0]
11
0111001
(39h)
0
CON/PRO
0
1 = Professional Mode (not supported by WM8777)
0 = S/PDIF transmitted data is audio PCM.
1 = S/PDIF transmitted data is not audio PCM.
0 = Transmitted data has copyright asserted.
1 = Transmitted data has no copyright assertion.
000 = Data from Audio interface has no pre-emphasis.
001 = Data from Audio interface has pre-emphasis.
010 = Reserved (Audio interface has pre-emphasis).
011 = Reserved (Audio interface has pre-emphasis).
All other modes are reserved and should not be used.
S/PDIF Channel status bits.
S/PDIF
1
2
AUDIO_N
CPY_N
0
0
Transmitter
Channel Bit
Control 1
5:3
PREEMPH[2:0]
000
7:6
7:0
CHSTMODE[1:0]
CATCODE[7:0]
00
00 = Only valid mode for consumer applications.
All other modes are reserved.
0111010
(3Ah)
00000000
Category Code. Refer to S/PDIF specification for details.
00h indicates “general” mode.
S/PDIF
Transmitter
Channel Bit
Control 2
0111011
(3Bh)
3:0
5:4
SRCNUM[3:0]
CHNUM1[1:0]
0000
00
Source Number. No definitions are attached to data. See S/PDIF
specification for details.
Channel Number for Subframe 1
S/PDIF
Transmitter
Channel Bit
Control 3
CHNUM1
Channel Status Bits[23:20]
0000: Do not use channel number
0001: Send to Left Channel
00
01
10
11
0010: Send to Right Channel
0000: Do not use channel number
7:6
CHNUM2[1:0]
00
Channel Number for Subframe 2
CHNUM2
Channel Status Bits[23:20]
00
01
10
11
0000: Do not use channel number
0001: Send to Left Channel
0010: Send to Right Channel
0000: Do not use channel number
0111100
(3Ch)
3:0
5:4
FREQ[3:0]
0001
11
Sampling Frequency. See S/PDIF specification for details.
0001 = Sampling Frequency not indicated.
S/PDIF
CLKACU[1:0]
Clock Accuracy of Generated clock.
Transmitter
Channel Bit
Control 4
00 = Level II
01 = Level I
10 = Level III
11 = Interface frame rate not matched to sampling frequency.
0111101
(3Dh)
0
MAXPAIFRX_WL
1
Maximum Audio sample word length
0 = 20 bits
S/PDIF
1 = 24 bits
PP Rev 1.94 November 2004
88
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
