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RIGOL Chapter 5 To Trigger the Oscilloscope
5-46 DS8000-R User Guide
I2S Trigger (Option)
In I2S trigger, the oscilloscope searches for the specified data value and take it as the
condition for identifying the trigger. You need to specify the serial clock line (SCLK, 1
pulse is found on the clock line once 1 bit of digital audio data is sent), frame clock
line (WS, used for switch the audio channel data), and serial data line (SDA, used for
transmit audio data represented in binary (2's complement)).
Below is the sequential chart of I2S bus.
Figure 5-22 Sequential Chart of I2S Bus
Trigger Type:
Click Type to select "I2S". Then, the current trigger setting information is displayed
at the upper-right corner of the screen, as shown in the figure below.
Source Selection:
Click SCLK, WS, and SDA to specify the sources for SCLK, WS, and SDA respectively.
The available choices are CH1-CH4. For details, refer to descriptions in "Trigger
Source". The current trigger source is displayed at the upper-right corner of the
screen.
Note: Only when we select the channel (that has been input with signals) as the
trigger source, can we obtain a stable trigger.
Edge Type:
Click SCLK Edge to select the desired clock edge.
âš«
Rising: samples the SDA data on the rising edge of the clock.
âš« Falling: samples the SDA data on the falling edge of the clock.
Audio:
Click Audio continuously to select "Left", "Right", or "Either".
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