9.4.3 Stereo Application Example - TDM Mode

Time-division multiplexing (TDM) is required for two or more devices to share a common DIN connection and a common DOUT connection. Using TDM mode, all devices transmit their DOUT data in user-specified sub-frames within one WCLK period. When one device transmits its DOUT information, the other devices place their DOUT terminals in a high impedance tri-state mode. The host processor can operate in I²S mode while the TAS2559 is running in I²S TDM mode to support sharing of the same DOUT line.

TDM mode is useable with I²S, LJF, RJF, and DSP interface modes. Refer to the respective sections for a description of how to set the TAS2559 into those modes.

Figure 42. Timing Diagram for I²S in TDM Mode with ASI_OFFSET1=2

For TDM mode, the number of bit-clocks per frame should be less than the programmed word-length of the data. Also the programmed offset value should be less than the number of bit-clocks per frame by at least the programmed word-length of the data.

Figure 43 shows the stereo configuration of the TAS2559 operating with the TAS2560 as second channel.

Figure 43. Stereo configuration with TAS2559 and TAS2560