WM8778 datasheet(24/50 Pages) WOLFSON

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WM8778

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PP Rev 1.7 June 2004

The WL[1:0] bits are used to control the input word length.

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

0001010

DAC Interface Control

5:4

DACWL

[1:0]

R11 (0Bh)

0001011

ADC Interface Control

5:4

ADCWL

[1:0]

Word Length

00 : 16 bit data

01: 20 bit data

10: 24 bit data

11: 32 bit data

Note: If 32-bit mode is selected in right justified mode, the WM8778 defaults to 24 bits.

In all modes, the data is signed 2's complement. The digital filters always input 24-bit data. If the

DAC is programmed to receive 16 or 20 bit data, the WM8778 pads the unused LSBs with zeros. If

the DAC is programmed into 32 bit mode, the 8 LSBs are ignored.

Note: In 24 bit I

2S mode, any width of 24 bits or less is supported provided that ADCLRC/DACLRC is

high for a minimum of 24 BCLKs and low for a minimum of 24 BCLKs.

A number of options are available to control how data from the Digital Audio Interface is applied to

the DAC.

MASTER MODES

Control bit ADCMS selects between audio interface Master and Slave Modes for ADC. In ADC

Master mode ADCLRC and ADCBCLK are outputs and are generated by the WM8778. In Slave

mode ADCLRC and ADCBCLK are inputs to WM8778.

BIT

LABEL

DEFAULT

DESCRIPTION

R12 (0Ch)

0001100

Interface Control

ADCMS

Audio Interface Master/Slave Mode

select for ADC:

0 : Slave Mode

1: Master Mode

Control bit DACMS selects between audio interface Master and Slave Modes for the DAC. In DAC

Master mode DACLRC and DACBCLK are outputs and are generated by the WM8778. In Slave

mode DACLRC and DACBCLK are inputs to WM8778.

BIT

LABEL

DEFAULT

DESCRIPTION

R12 (0Ch)

0001100

Interface Control

DACMS

Audio Interface Master/Slave Mode

select for DAC:

0 : Slave Mode

1: Master Mode

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