WM8581SEFT Wolfson Microelectronics Ltd., WM8581SEFT Datasheet - Page 58

• Manufacturer Part Number: WM8581SEFT
• Description: Multichannel Codec with S/pdif Transceiver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8581
S/PDIF RECEIVER
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Table 52 S/PDIF Transmitter Channel Bit Control 5
SPDTXCHAN 5
REGISTER
ADDRESS
R35
23h
REGISTER
SPDMODE
ADDRESS
PWRDN 2
GPO2
GPO3
R36
R39
R40
R51
24h
26h
27h
33h
BIT
3:1
7:4
0
INPUT SELECTOR
The S/PDIF receiver has one dedicated input, SPDIFIN1. This pin is a IEC-60958-3-compatible
comparator input by default or, if SPDIFIN1MODE is set, the pin will be a CMOS-compatible input.
There are three other pins which can be configured as either S/PDIF inputs or general purpose
outputs (GPOs). The four S/PDIF inputs are multiplexed to allow one input to go to the S/PDIF
receiver for decoding. The S/PDIF receiver can be powered down using the SPDIFRXD register bit.
BIT
2:1
3:0
7:4
3:0
5
0
ORGSAMP
TXWL[2:0]
MAXWL
LABEL
[3:0]
SPDIFIN1MODE
RXINSEL[1:0]
GPO3OP[3:0]
GPO4OP[3:0]
GPO5OP[3:0]
SPDIFRXD
LABEL
CHANNEL
STATUS
35:33
39:36
BIT
32
DEFAULT
0010
0011
0100
00
1
1
DEFAULT
0000
101
1
Selects the input circuit type for the SPDIFIN1 input
0 = CMOS-compatible input
1 = Comparator input. Compatible with 500mVpp AC
coupled consumer S/PDIF input signals as defined in
IEC60958-3.
S/PDIF Receiver input mux select.
The general purpose inputs must be configured using
GPOxOP to be either CMOS or comparator inputs if
selected by RXINSEL.
00 = Select SPDIFIN1
01 = Select SPDIFIN2 (MFP3)
10 = Select SPDIFIN3 (MFP4)
11 = Select SPDIFIN4 (MFP5)
GPO pin Configuration Select.
1110 = Set GPO as S/PDIF input (CMOS-compatible
input).
1111 = Set GPO as S/PDIF input (compatible with
500mVpp AC coupled consumer S/PDIF input signals
as defined in IEC-60958-3).
For GPO defaults, see Table 65.
S/PDIF Receiver powerdown
0 = S/PDIF Receiver enabled
1 = S/PDIF Receiver disabled
Maximum Audio sample word length
0 = 20 bits
1 = 24 bits
Audio Sample Word Length.
000 = Word Length Not Indicated
All other combinations reserved
Original Sampling Frequency. See S/PDIF
specification for details.
0000 = original sampling frequency not
indicated
TXWL[2:0]
001
010
100
101
110
DESCRIPTION
DESCRIPTION
MAXWL==1
20 bits
22 bits
23 bits
24 bits
21 bits
PP Rev 1.0 March 2006
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MAXWL==0
16 bits
18 bits
19 bits
20 bits
17 bits
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