WM8741 datasheet(29/63 Pages) WOLFSON

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WM8741

PP Rev 1.3 October 2007

Figure 23 Bi-phase DSD Mode Timing Diagram

SOFTWARE CONTROL MODE

Software control allows access to all features of the WM8741. Selection of control mode is achieved

by configuring the state of MODE/LRSEL (pin 24):

NAME

DESCRIPTION

MODE/

LRSEL

0 = Hardware control mode

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.

BIT

LABEL

DEFAULT

DESCRIPTION

Mode Control 1

07h

[1:0]

MODESEL

DSD/PCM mode select :

00 = PCM mode

01 = Direct DSD Operation

10 = DSD plus mode

11 = Unused

Table 15 PCM/DSD Software Mode Selection

PCM DIGITAL AUDIO INTERFACE CONTROL REGISTERS

The PCM digital audio input format is configured by register bits FMT [1:0] and IWL[1:0]:

BIT

LABEL

DEFAULT

DESCRIPTION

1:0

IWL[1:0]

Audio interface input word length

select

00 = 16-bit

01 = 20-bit

10 = 24-bit

11 = 32-bit

Format Control

05h

3:2

FMT[1:0]

Audio interface input format select

00 = Right justified

01 = Left justified

10 = I

11 = DSP

Table 16 Interface Format Controls

Note:

In all modes, the data is signed 2's complement. The WM8741 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.

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