WM8731L WOLFSON [Wolfson Microelectronics plc], WM8731L Datasheet - Page 39

• Manufacturer Part Number: WM8731L
• Description: Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8731 / WM8731L
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MASTER AND SLAVE MODE OPERATION
The WM8731/L can be configured as either a master or slave mode device. As a master mode
device the WM8731/L controls sequencing of the data and clocks on the digital audio interface. As a
slave device the WM8731/L responds with data to the clocks it receives over the digital audio
interface. The mode is set with the MS bit of the control register as shown in Table 16.
Table 16 Programming Master/Slave Modes
As a master mode device the WM8731/L controls the sequencing of data transfer (ADCDAT,
DACDAT) and output of clocks (BCLK, ADCLRC, DACLRC) over the digital audio interface. It uses
the timing generated from either its on-board crystal or the MCLK input as the reference for the clock
and data transitions. This is illustrated in Figure 31. ADCDAT is always an output from and DACDAT
is always an input to the WM8731/L independent of master or slave mode.
Figure 31 Master Mode
As a slave device the WM8731/L sequences the data transfer (ADCDAT, DACDAT) over the digital
audio interface in response to the external applied clocks (BCLK, ADCLRC, DACLRC). This is
illustrated in Figure 32.
Figure 32 Slave Mode
Note that the WM8731/L relies on controlled phase relationships between audio interface BCLK,
DACLRC and the master MCLK or CLKOUT. To avoid any timing hazards, refer to the timing section
for detailed information.
0000111
Digital Audio Interface
Format
Note: ADC and DAC can run at different rates
Note: The ADC and DAC can run at different rates
WM8731
CODEC
WM8731
CODEC
REGISTER
ADDRESS
ADCLRC
ADCDAT
DACLRC
DACDAT
ADCLRC
ADCDAT
DACLRC
DACDAT
BCLK
BCLK
6
BIT
MS
LABEL
0
DEFAULT
ENCODER/
DECODER
ENCODER/
DECODER
DSP
DSP
Master Slave Mode Control
1 = Enable Master Mode
0 = Enable Slave Mode
DESCRIPTION
PD Rev 4.3 August 2006
Production Data
39