9.4.1.4 DSP Mode

Audio Serial Interface 1 can be put into DSP Mode by programming B0_P1_R1_D[7:5] = 001 and B0_P1_R2_D[7:5] = 001 . Audio Serial Interface 2 can be put into DSP Mode by programming B0_P1_R21_D[7:5] = 001 and B0_P1_R22_D[7:5] = 001. In DSP mode, the rising edge of the word clock starts the data transfer with the left channel data first and immediately followed by the right channel data. Each data bit is valid on the falling edge of the bit clock.

Figure 32. Timing Diagram for DSP Mode

Figure 33. Timing Diagram for DSP Mode with Offset=1

Figure 34. Timing Diagram for DSP Mode with Offset=0 and Inverted Bit Clock

For DSP mode, the number of bit-clocks per frame should be greater than twice 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.