CS47L85 datasheet(166/370 Pages) CIRRUS

166 / 370 page

CS47L85

166

Rev 4.3

DIGITAL AUDIO INTERFACE

The CS47L85 provides four audio interfaces, AIF1, AIF2, AIF3 and AIF4. Each of these is independently configurable on

the respective transmit (TX) and receive (RX) paths. AIF1 and AIF2 support up to 8 channels of input and output signal

paths; AIF3 and AIF4 support up to 2 channels of input and output signal paths.

The data source(s) for the audio interface transmit (TX) paths can be selected from any of the CS47L85 input signal paths,

or from the digital core processing functions. The audio interface receive (RX) paths can be selected as inputs to any of the

digital core processing functions or digital core outputs. See “Digital Core” for details of the digital core routing options.

The digital audio interfaces provide flexible connectivity for multiple processors and other audio devices. Typical connections

include Applications Processor, Baseband Processor and Wireless Transceiver. Note that the SLIMbus interface also

provides digital audio input/output paths, providing options for additional interfaces. A typical configuration is illustrated in

Figure 46.

The audio interfaces AIF1 and AIF2 are referenced to DBVDD1 and DBVDD2 respectively; interfaces AIF3 and AIF4 are

referenced to DBVDD3. This enables the CS47L85 to connect easily between application sub-systems on different voltage

domains.

Audio Interface 1

Audio Interface 2

Audio Interface 3

HDMI

Device

Baseband

Processor

Wireless

Transceiver

CS47L85

SLIMbus interface

Applications

Processor

Figure 46 Typical AIF Connections

In the general case, the digital audio interface uses four pins:



TXDAT: Data output



RXDAT: Data input



BCLK: Bit clock, for synchronisation



LRCLK: Left/Right data alignment clock

In master interface mode, the clock signals BCLK and LRCLK are outputs from the CS47L85. In slave mode, these signals

are inputs, as illustrated below.

CS47L85 Datasheet(PDF) 166 Page - Cirrus Logic

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