Texas Instruments ADCx120EVM, User Manual, Page: 18 / 36

6.1 Configuring the Audio Serial Bus for the I
2
S Output
The TLV320ADCx120 features a highly flexible audio serial bus that can be configured to implement a wide
range of data formats. The default format is TDM, however the GUI can be used to change the data format
to I
2
S. This section describes how to configure the TLV320ADCx120EVM for a 2-channel I
2
S output to a USB
audio at 16 bits and 48 kHz. Configure the AC-MB for USB audio as described in Section 6 . As shown in Figure
6-6 , select the audio serial bus tab.
Figure 6-6. Audio Serial Bus Tab
In the ASI format configuration pane (shown in Figure 6-7 ), change the protocol format to I
2
S, and the word
length to 16 bits.
Figure 6-7. ASI Format Configuration
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 Figure 6-8 , in the clock monitor pane.
Figure 6-8. Clock Monitor Pane
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18 ADCx120EVM-PDK, PCMD3140EVM-PDK Evaluation Module SBAU359A – MAY 2019 – REVISED JUNE 2021
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