Chapter 5 To Trigger the Oscilloscope RIGOL
MSO8000 User Guide 5-49
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:
Press Type, and then rotate the multifunction knob to select "I2S". Press down
the knob to select the trigger type. Then, the current trigger setting information is
displayed at the upper-right corner of the screen, as shown in the figure below. You
can also press Type continuously or enable the touch screen to tap the desired
trigger type and select it.
Source Selection:
Press SCLK, WS, and SDA to specify the sources for SCLK, WS, and SDA
respectively. The available choices are CH1-CH4, EXT, or D0-D15. 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:
Press SCLK Edge continuously or rotate the multifunction knob 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.
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