CS47L35 datasheet(113/300 Pages) CIRRUS

113 / 300 page

DS1085F3

113

CS47L35

4.6 Digital Audio Interface

4.6.4

TDM Operation Between Three or More Devices

The AIF operation described in Section 4.6.3 illustrates how multiple audio channels can be interleaved on a single TXDAT

or RXDAT pin. The interface uses TDM to allocate time periods to each of the audio channels in turn.

This form of TDM is implemented between two devices, using the electrical connections shown Fig. 4-35 or Fig. 4-36.

It is also possible to implement TDM between three or more devices. This allows one codec to receive audio data from

two other devices simultaneously on a single audio interface, as shown in Fig. 4-45, Fig. 4-46, and Fig. 4-47.

The CS47L35 provides full support for TDM operation. The TXDAT pin can be tristated when not transmitting data, in order

to allow other devices to transmit on the same wire. The behavior of the TXDAT pin is configurable, to allow maximum

flexibility to interface with other devices in this way.

Typical configurations of TDM operation between three devices are shown in Fig. 4-45, Fig. 4-46, and Fig. 4-47.

Figure 4-45. TDM with CS47L35 as Master

Figure 4-46. TDM with Other Codec as Master

Processor

TXDAT

LRCLK

RXDAT

BCLK

TXDAT

LRCLK

RXDAT

BCLK

CS47L35

or similar

CODEC

TXDAT

LRCLK

RXDAT

BCLK

TXDAT

LRCLK

RXDAT

BCLK

Processor

CS47L35

or similar

CODEC

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