WM8777 Datasheet, PDF (90/102 Pages) Wolfson Microelectronics plc – 24 BIT 192KHZ AV RECEIVER ON A CHIP

WM8777
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REGISTER
BIT
ADDRESS
LABEL
DEFAULT
DESCRIPTION
Input Selector 5:4
RXINSEL[1:0]
00
S/PDIF Receiver input mux select. Note that the general purpose
inputs must be configured using GPIOxOP to be either CMOS or
comparator inputs if selected by RXINSEL.
00 = S/PDIF_IN1
01 = S/PDIF_IN2 (GPIO1)
10 = S/PDIF_IN3 (GPIO2)
11 = S/PDIF_IN4 (GPIO3)
6
FILLMODE
0
Determines what SPDIF_RX should do if the validity bit indicates
invalid data:
0 = Data from SPDIF_RX remains static at last valid sample.
1 = Data from SPDIF_RX is output as all zeros.
7
ALWAYSVALID
0
Used to override the recovered validity bit.
0 = Use validity bit.
1 = Ignore validity bit.
8
ADCCLKSRC
0
ADC clock source
0 = ADCMCLK is from MCLK pin and ADCPBCLK is from PBCLK
pin
1 = ADCMCLK is from GPIO1, and ADPBCLK is from GPIO2.
(Note that when in this mode RXINSEL must not be set to 01 or
10.)
1000001
0
RX2DAC
0
Received S/PDIF PCM data to DAC.
(41h)
0 = DAC1 takes data from Primary Audio Interface.
Interface
Source Select _2:1
TXSRC[1:0]
1 = DAC1 takes data from S/PDIF receiver.
00
S/PDIF Transmitter Data Source.
00 = S/PDIF received data.
01 = ADC digital output data.
10 = Secondary Audio Interface received data
11 = DAC Audio Interface Received data.
3
TXRXTHRU
0
Only used if TXSRC==00. Configures only the Channel Bit in the
S/PDIF frame.
0 = Channel data equal to recovered channel data.
1 = Channel data taken from channel status registers.
5:4 PAIFSRC[1:0]
01
Audio Interface output source
00 = S/PDIF received data
01 = ADC digital output data
10 = Secondary Audio Interface received data
11 = Power-down Primary Audio Interface Transmitter
7:6
SAIFSRC[1:0]
00
Secondary Audio Interface Transmitter Data Source.
00 = S/PDIF received data.
01 = ADC digital output data.
10 = Power-down Secondary Audio Interface Transmitter
11 = Primary Audio Interface received data.
1000010
5:3
FPLL[2:0]
111
Select jitter attenuation bandwidth.
(42h)
000 = Invalid
S/PDIF
Data/Clock
Recovery
001 = 28.84Hz
010 = 14.92Hz
011 = 7.46Hz
100 = 3.73Hz
101 = 1.87Hz
110 = 0.97Hz
111 = 0.47Hz
w
PP Rev 1.94 November 2004
90