WM8734-EV1M
MASTER MODE OPERATION
As well as being used in Slave mode as described in the default settings already mentioned, the
WM8734 may be used in Master mode. When using any of the default setups, the WM8734 can be
easily changed from a Slave to a Master device by writing to the WM8734 registers using the supplied
software.
ADC NORMAL SETUP
To set the WM8734-EV1B into ADC Master mode, press the ‘ADC’ default button, change the
‘Master/Slave’ switch to Master and ensure that the ‘Active’ switch is set to the Active position. Then
press the ‘Submit’ button. The board should be set up as shown in Figure 10 and Table 8.
Note: The only digital signal that is supplied to the WM8734 audio interface is MCLK. All other
signals are output from the WM8734 in Master Mode.
+1.42V
to
+5V GND
+3.6V
PARALLEL PORT
AGND
J6
J7
J1
J4
J2
J3
+2.7V
to
+3.6V
N E
O P
0
SW1
4
6
3
2
1
1
5
1
J8
LLINEIN
1
J10
J15
J9
OPT_
SPDIF_
IN
SW2
RLINEIN
ROUT
The SPDIF input is
required to provide
clocks for the
WM8734 audio
interface.
J14
SPDIF_
IN
H1
H2
1
SW3
OPT_
SPDIF_
OUT
LOUT
1
J16
J17
1
J18
J21
SPDIF_
OUT
J20
Figure 10 WM8734-EV1B Board Setup for ADC Operation in Master Mode
Note: Setup for Master Mode; SPI software control mode. The relevant WM8734 registers
must be set using the software.
LINKS & JUMPERS
J8
STATUS
OPEN
DESCRIPTION
SPI software interface control
ROUT signal is AC coupled
LOUT signal is AC coupled
Master mode
J21
OPEN
OPEN
OPEN
OPEN
OPEN
J18
J14 (BCLK)
J16 (DACLRC)
J17 (ADCLRC)
SW3OFF Position
H1
Master mode
Master mode
ADCLRC input not required for master mode
Opposite pins 1/2
and 3/4 SHORT.
All other opposite
pins OPEN.
Digital audio interface input (DAC) signals. MCLK
is the only audio interface signal that should be
supplied to the WM8734.
H2
All opposite pins
SHORT
Digital audio interface output (ADC) signals
Table 8 ADC Normal Master Mode Set-up
Rev 1.2 November 2002
14
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
