SLASEC2B November 2016 – February 2019 TAS2557
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 TAS2557 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 TAS2557 into those modes.
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.