WM1811A datasheet(175/328 Pages) WOLFSON

175 / 328 page

Production Data

WM1811A

PD, November 2013, Rev 4.1

175

AIF3 - SIGNAL PATH CONFIGURATION AND TRI-STATE CONTROL

The AIF3 interface provides Mono PCM digital audio paths to/from the AIF2 DSP functions. The AIF3

interface can also support stereo digital audio paths via multiplexers to provide alternate connections

to AIF1 or AIF2.The relevant multiplexers are illustrated in Figure 66.

AIF1_DACDAT_SRC

AIF3_ADCDAT_SRC[1:0]

AIF2_ADCDAT_SRC

DIGITAL AUDIO

INTERFACE 2 (AIF2)

DIGITAL AUDIO

INTERFACE 1 (AIF1)

MONO PCM

INTERFACE

Left / Right source select /

Mono Mix control

AIF2DAC_SRC

AIF3ADC_SRC[1:0]

AIF2_DACDAT_SRC

Left / Right source select /

Mono Mix control

Figure 66 Audio Interface AIF3 Configuration

Note that all of the AIF3 connections are supported on pins which also provide GPIO functions. These

pins must be configured as AIF functions when used as audio interface pins. See “General Purpose

Input/Output”.

The GPIO8 pin supports the DACDAT3 function, which provides the input to the AIF3 Mono PCM

interface.

When AIF3 Mono PCM input is used, this must be configured as an input to the AIF2 input paths

using the AIF2DAC_SRC register as described in Table 102. The AIF3 Mono input may be selected

on either channel (Left or Right), with AIF2 input enabled on the opposite channel at the same time.

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

AIF2DACR_ENA and AIF2DACL_ENA register bits defined in Table 95.

The DACDAT3 input pin can also be used as an input (mono or stereo) to AIF1 or AIF2. The data

input source for AIF1 is selected using the AIF1_DACDAT_SRC register. The data input source for

AIF2 is selected using the AIF2_DACDAT_SRC register.

The DACDAT3 input pin can also be routed to the ADCDAT2 output. The ADCDAT2 source is

selected using the AIF2_ADCDAT_SRC register.

WM1811A Datasheet(PDF) 175 Page - Wolfson Microelectronics plc