WM8742 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8742' PDF : 65 Pages View PDF
WM8742
Production Data
Figure 23 Bi-phase DSD Mode Timing Diagram
SOFTWARE CONTROL MODE
Software control allows access to all features of the WM8742. Selection of control mode is achieved
by configuring the state of MODE/LRSEL (pin 24):
PIN
NAME
DESCRIPTION
24
MODE/ 0 = Hardware control mode
LRSEL 1 = 3-wire serial control mode
Z = 2-wire serial control mode
Table 14 Control Mode Configuration
DSD AND PCM MODE SWITCHING
The audio interface mode can be switched between DSD and PCM by writing MODESEL[1:0] in R7.
It is recommended that the chip is forced into a MUTE state before dynamically switching modes.
REGISTER ADDRESS BIT LABEL DEFAULT
R7
[1:0] MODESEL
00
Mode Control 1
07h
Table 15 PCM/DSD Software Mode Selection
DESCRIPTION
DSD/PCM mode select :
00 = PCM mode
01 = Direct DSD Operation
10 = DSD plus mode
11 = Unused
PCM DIGITAL AUDIO INTERFACE CONTROL REGISTERS
The PCM digital audio input format is configured by register bits FMT [1:0] and IWL[1:0]:
REGISTER ADDRESS
R5
Format Control
05h
BIT LABEL
1:0 IWL[1:0]
3:2 FMT[1:0]
Table 16 Interface Format Controls
DEFAULT
10
10
DESCRIPTION
Audio interface input word length
select
00 = 16-bit
01 = 20-bit
10 = 24-bit
11 = 32-bit
Audio interface input format select
00 = Right justified
01 = Left justified
10 = I2S
11 = DSP
Note:
1. In all modes, the data is signed 2's complement. The WM8742 digital filters always input
24-bit data. If the interface is programmed into 32 bits, dither is applied according to
Table 37 before truncation to the internal wordlength.
w
PD, Rev 4.3, February 2013
28
Share Link: 
