SLASF32 December 2023 TAD5142
ADVANCE INFORMATION
Digital audio data flows between the host processor and the TAD5142 on the digital audio serial interface (ASI), or audio bus. This highly flexible ASI bus includes a TDM mode for multichannel operation, support for the I2S and LJF, and the pin-selectable controller-target configurability for bus clock lines.
The device supports an audio bus controller or target mode of operation using the hardware pin MD0. In target mode, FSYNC and BCLK work as input pins whereas in controller mode, FSYNC and BCLK work as output pins generated by the device. Table 7-1 shows the controller and target mode selection using the MD0 pin.
MD0 | CONTROLLER AND TARGET SELECTION |
---|---|
Short to Ground | Target I2S Mode |
Short to Ground with 4.7K Ohms | Target TDM Mode |
Short to AVDD | Controller I2S Mode |
Short to AVDD with 4.7K Ohms | Controller TDM Mode |
Short to AVDD with 22K Ohms | Target LJ Mode |
The word length for audio serial interface (ASI) in TAD5142 can be selected through MD1 and MD2 Pins in target mode of operation. In controller mode, fixed word length of 32 bits is supported. The TAD5142 also supports 1.8V AVDD operation in target mode with 32 bit word length. Table 7-2 shows the configuration table for setting word length and AVDD supply voltage
MD1 | MD2 | CONTROLLER AND TARGET SELECTION |
---|---|---|
Low | Low | Word
Length=32 AVDD=3.3V |
Low | High | Word
Length=32 AVDD=1.8V |
High | Low | Word
Length=24 AVDD=3.3V |
High | High | Word
Length=16 AVDD=3.3V |
The TAD5142 also offers daisy chain option for TDM mode of operation. This option is auto enabled whenever device is selected to be in TDM Mode with MD0. MD6 Pin acts as a Daisy Chain output in this mode. In this case, Device plays the data coming on Slot 0 and Slot 1 and sends the shifted data on remaining slots on MD6.