WM8580_07_12 Datasheet, PDF (56/97 Pages) Wolfson Microelectronics plc – Multichannel CODEC with S/PDIF Transceiver

WM8580
Frame
1
.........
Production Data
Frame
192
Subframe 1
Subframe 2
0 34 78
Sync
preamble
Aux
Audio Sample Word
27 28
31
32 bit
VUCP
Word
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.
REGISTER BIT
ADDRESS
R30
1:0
SPDTXCHAN 0
1Eh
LABEL
TXSRC[1:0]
2
OVWCHAN
3
REAL_
THROUGH
4
TXVAL_
OVWR
5
TXVAL_SF0
6
TXVAL_SF1
R51
4
SPDIFTXD
PWRDN 2
33h
Table 49 S/PDIF Transmitter Control
DEFAULT
DESCRIPTION
00
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
0
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.
0
S/PDIF Through Mode Control
0 = SPDIFOP pin sources output of S/PDIF Transmitter
1 = SPDIFOP pins sources output of S/PDIF IN Mux
0
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.
0
Overwrite Mode S/PDIF Transmitter Validity Sub-Frame 0
0 = transmit validity = 0
1 = transmit validity = 1
0
Overwrite Mode S/PDIF Transmitter Validity Sub-Frame 1
0 = transmit validity = 0
1 = transmit validity = 1
1
S/PDIF Transmitter powerdown
0 = S/PDIF Transmitter enabled
1 = S/PDIF Transmitter disabled
w
PD Rev 4.3 August 2007
56