wm8805 Wolfson Microelectronics plc, wm8805 Datasheet - Page 20

• Manufacturer Part Number: wm8805
• Description: 8 1 Digital Interface Transceiver With Pll
• Manufacturer: Wolfson Microelectronics plc

WM8805
DIGITAL ROUTING CONTROL
Table 18 Digital Signal Routing Control Registers
w
REGISTER
ADDRESS
SPDTX4
PWRDN
PLL6
R30
1Eh
R21
08h
15h
R8
BIT
2:0
2
6
Figure 15 Digital Routing Paths within the WM8805
Digital signal routing within the WM8805 is controlled by two registers, RXINSEL and TXSRC.
RXINSEL selects the S/PDIF input which is passed through the clock and data recovery circuit to the
S/PDIF receiver and TXSRC selects the data source that is passed to the S/PDIF transmitter.
In order to ensure proper operation when changing TXSRC, the S/PDIF transmitter module should be
powered down prior to changing the TXSRC control register and powered up again once the routing
path has been changed.
RXINSEL[2:0]
SPDIFTXPD
TXSRC
LABEL
DEFAULT
000
1
1
S/PDIF Rx Input Select
Select the S/PDIF input to pass to the receiver circuit.
000 – RX0
001 – RX1
010 – RX2
011 – RX3
100 – RX4
101 – RX5
110 – RX6
111 – RX7
S/PDIF Transmitter Powerdown
0 = S/PDIF transmitter enabled
1 = S/PDIF transmitter disabled
S/PDIF Transmitter Data Source
0 = S/PDIF Received Data – SPDIFTXCLK Source =
CLK2
1 = Digital Audio Interface Received Data –
SPDIFTXCLK Source = MCLK Input/Output Signal at
MCLK Pin
DESCRIPTION
PD, Rev 4.5, March 2009
Production Data
20