WM1811A datasheet(176/328 Pages) WOLFSON

176 / 328 page

WM1811A

Production Data

PD, November 2013, Rev 4.1

176

The GPIO9 pin supports the ADCDAT3 function, which supports the output from the AIF3 Mono PCM

interface.The source for the ADCDAT3 pin is selected using the AIF3_ADCDAT_SRC register.

When AIF3 Mono PCM output is used, the data source must be configured using the AIF3ADC_SRC

When AIF3 Mono PCM output is used, the AIF2 output paths must be enabled using the

AIF2ADCR_ENA and AIF2ADCL_ENA register bits. Note that, if AIF3 Mono PCM output is required

and AIF2 output is not used, then the AIF2 output can be disabled using the AIF2TXL_ENA and

AIF2TXR_ENA registers.See Table 95 for details of these registers.

The ADCDAT3 pin can also be used as an alternate data output (mono or stereo) from AIF1 or AIF2,

or can be connected to the DACDAT2 data input.

The AIF3 interface can be tri-stated by setting the AIF3_TRI register. When this bit is set, then all of

the AIF3 outputs are un-driven (high-impedance). The AIF3_TRI register only affects those pins which

are configured for AIF3 functions; it does not affect pins which are configured for other functions.

The AIF3 control registers are described in Table 102.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R6 (0006h)

Power

Management

(6)

10:9

AIF3ADC_S

RC [1:0]

AIF3 Mono PCM output source select

00 = None

01 = AIF2ADC (Left) output path

10 = AIF2ADC (Right) output path

11 = Reserved

8:7

AIF2DAC_S

RC [1:0]

AIF2 input path select

00 = Left and Right inputs from AIF2

01 = Left input from AIF2; Right input from

AIF3

10 = Left input from AIF3; Right input from

AIF2

11 = Reserved

AIF3_TRI

AIF3 Audio Interface tri-state

0 = AIF3 pins operate normally

1 = Tri-state all AIF3 interface pins

Note that pins not configured as AIF3

functions are not affected by this register.

4:3

AIF3_ADCD

AT_SRC

[1:0]

GPIO9/ADCDAT3 Source select

00 = AIF1 ADCDAT1

01 = AIF2 ADCDAT2

10 = DACDAT2

11 = AIF3 Mono PCM output

Note that GPIO9 must be configured as

ADCDAT3.

AIF2_ADCD

AT_SRC

ADCDAT2 Source select

0 = AIF2 ADCDAT2

1 = GPIO8/DACDAT3

For selection 1, the GPIO8 pin must also be

configured as DACDAT3.

AIF2_DACD

AT_SRC

AIF2 DACDAT Source select

0 = DACDAT2

1 = GPIO8/DACDAT3

For selection 1, the GPIO8 pin must also be

configured as DACDAT3.

WM1811A Datasheet(PDF) 176 Page - Wolfson Microelectronics plc

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