WM1811A datasheet(153/328 Pages) WOLFSON

153 / 328 page

Production Data

WM1811A

PD, November 2013, Rev 4.1

153

All four of these modes are MSB first. They are described inthe following sections. Refer to the “Signal

Timing Requirements” section for timing information.

Time Division Multiplexing (TDM) is available in all four data format modes. The WM1811A can be

configured to transmit and receive in one of two timeslots.

Two variants of DSP mode are supported - ‘Mode A’ and ‘Mode B’. Mono operation can be selected

on either audio interface in both DSP modes. PCM operation is supported using the DSP mode.

MASTER AND SLAVE MODE OPERATION

The WM1811A digital audio interfaces can operate as a master or slave as shown in Figure 45 and

Figure 46. The associated control bits are described in “Digital Audio Interface Control”.

Figure 45 Master Mode

Figure 46 Slave Mode

OPERATION WITH TDM

Time division multiplexing (TDM) allows multiple devices to transfer data simultaneously on the same

bus. The WM1811A ADCs and DACs support TDM in master and slave modes for all data formats

and word lengths. TDM is enabled and configured using register bits defined in the “Digital Audio

Interface Control” section.

WM1811A

Processor

WM1811A

or similar

CODEC

ADCDAT

LRCLK

DACDAT

BCLK

ADCDAT

LRCLK

DACDAT

BCLK

WM1811A

Processor

WM1811A

or similar

CODEC

ADCDAT

LRCLK

DACDAT

BCLK

ADCDAT

LRCLK

DACDAT

BCLK

Figure 47 TDM with WM1811A as Master

Figure 48 TDM with Other CODEC as Master

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