Quick Start
18
SBAU335 – May 2019
Copyright © 2019, Texas Instruments Incorporated
ADCx140EVM-PDK
When the protocol format is changed to I
2
S in the GUI, the USB audio processor on the AC-MB also
changes the audio format to I
2
S. The GUI reads the ASI status register (page 0 register 0x15), providing
the detected sampling rate and BCLK and FSYNC ratio. The ASI status register can also be read
manually in the audio serial bus tab by clicking the
Read
button, as shown in
, in the clock
monitor pane.
Figure 21. Clock Monitor Pane
The default slot assignment for channel 1 is left slot 0 and the default slot assignment for channel 2 is left
slot 1. As shown in
, change the channel 2 slot assignment to right slot 0. The diagram at the top
of the window updates to display the data format and slots selected.
Figure 22. Channel Output Configuration and Diagram
The AC-MB USB audio currently supports only two channels per data line when in I
2
S mode and the
BCLK and FSYNC ratio is fixed at 64. The EVM is now ready for use with the audio recording program of
your choice.