Chapter 5 To Trigger the Oscilloscope RIGOL
MSO8000 User Guide 5-39
SPI Trigger (Option)
In SPI trigger, after the CS or timeout condition is satisfied, the oscilloscope triggers
when the specified data is found. When using SPI trigger, you need to specify the
SCL clock sources (CLK) and SDA data sources (MISO). Below is the sequential chart
of SPI bus.
Figure 5-16 Sequential Chart of SPI Bus
Trigger Type:
Press Type, and then rotate the multifunction knob to select "SPI". 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 to select the trigger type or enable the touch
screen to tap the desired trigger type and select it.
Source Selection:
Press CLK and MISO to specify the sources of CLK and MISO respectively. They can
be set to CH1-CH4 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 Slope continuously to select the desired clock edge type.
âš« Rising: samples the MISO data on the rising edge of the clock.
âš« Falling: samples the MISO data on the falling edge of the clock.
Trigger Condition:
Press When continuously to select the desired trigger condition.
âš« Timeout: the oscilloscope starts to search for the data (MISO) on which to
trigger after the clock signal (CLK) stays in the idle state for a specified period of
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