SBASB12 May 2024 PCM1809
PRODUCTION DATA
Digital audio data flows between the host processor and the PCM1809 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 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 MSZ. 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 6-1 shows the controller and target mode selection using the MSZ pin.
MSZ | CONTROLLER AND TARGET SELECTION |
---|---|
Low | Target mode of operation |
High | Controller ode of operation |
The bus protocol TDM or I2S format can be selected by using the FMT0 pin. As shown in Table 6-2, these modes are all most significant byte (MSB)-first, pulse code modulation (PCM) data format, with an output channel data word-length of 32 bits.
FMT0 | AUDIO SERIAL INTERFACE FORMAT |
---|---|
Low | 2-channel output with inter IC sound (I2S) mode |
High | 2-channel output with time division multiplexing (TDM) mode |