Rigol DS70000-AUDIOA - Trigger and analysis option for audio serial bus

Triggering and analysis of serial audio bus (I2S)

I2S triggering (option)
In I2S triggering, the oscilloscope searches for the specified data value and takes it as a condition to identify the trigger. 

You must specify the serial clock line (SCLK, 1 pulse is found on the clock line once 1 bit of digital audio data is sent), the frame clock line (WS, used to switch audio channel data), and the serial data line (SDA, used to transmit audio data represented in binary (two's complement)).