WM8580AGEFT Wolfson Microelectronics Ltd., WM8580AGEFT Datasheet - Page 56

• Manufacturer Part Number: WM8580AGEFT
• Description: Multichannel Codec with S/pdif Transceiver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8580
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Table 49 S/PDIF Transmitter Control
SPDTXCHAN 0
REGISTER
ADDRESS
PWRDN 2
R30
1Eh
R51
33h
Figure 33 S/PDIF Format
S/PDIF TRANSMITTER
The S/PDIF transmitter generates the S/PDIF frames, and outputs on the SPDIFOP pin. The audio
data for the frame can be taken from one of four sources, selectable using the TXSRC register. The
transmitter can be powered down using the SPDIFTXD register bit. The S/PDIF Transmitter can be
bypassed by setting the REAL_THROUGH register control bit. When set, the SPDIFOP pin sources
the output of the S/PDIF input mux.
BIT
1:0
4
2
3
4
5
6
0
preamble
Frame
Sync
1
TXVAL_SF0
TXVAL_SF1
3 4
TXSRC[1:0]
SPDIFTXD
OVWCHAN
THROUGH
TXVAL_
LABEL
OVWR
REAL_
Aux
7 8
Subframe 1
DEFAULT
00
1
0
0
0
0
0
S/PDIF Transmitter Data Source
00 = S/PDIF received data (see REAL_THROUGH)
01 = ADC digital output data.
10 = Secondary Audio Interface
11 = Audio Interface received data
Overwrite Channel Status
Only used if TXSRC=00. Overwrites the received channel
status data using data read from S/PDIF transmitter
channel status register
0 = Channel data equal to recovered channel data.
1 = Channel data taken from channel status registers.
S/PDIF Through Mode Control
0 = SPDIFOP pin sources output of S/PDIF Transmitter
1 = SPDIFOP pins sources output of S/PDIF IN Mux
S/PDIF Transmitter Validity Overwrite Mode
0 = disabled, validity bit is 0 when transmitter sources
ADC, PAIF or SAIF, or is matches the S/PDIF input
validity when S/PDIF transmitter sources S/PDIF receiver.
1 = enabled, validity bit transmitted for subframe 0 is
defined by TXVAL_SF0, validity bit transmitted for
subframe 1 is defined by TXVAL_SF1.
Overwrite Mode S/PDIF Transmitter Validity Sub-Frame 0
0 = transmit validity = 0
1 = transmit validity = 1
Overwrite Mode S/PDIF Transmitter Validity Sub-Frame 1
0 = transmit validity = 0
1 = transmit validity = 1
S/PDIF Transmitter powerdown
0 = S/PDIF Transmitter enabled
1 = S/PDIF Transmitter disabled
Audio Sample Word
. . . . . . . . .
Subframe 2
DESCRIPTION
27 28
V
PD Rev 4.3 August 2007
U
C
Frame
192
31
P
Production Data
32 bit
Word
56