Spi Trigger (Option) - Rigol DS8000-R Series User Manual

Chapter 5 To Trigger the Oscilloscope

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 and SDA data sources. Below is the sequential chart of SPI bus.
CS
SCL
SDA
Trigger Type:
Click Type to select "SPI". 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 CLK and MISO to specify the sources of SCL and SDA respectively. They can be
set to 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 Slope continuously to select the desired clock edge type.
Rising: samples the SDA data on the rising edge of the clock.
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Falling: samples the SDA data on the falling edge of the clock.
⚫
Trigger Condition:
Click When continuously to select the desired trigger condition.
Timeout: the oscilloscope starts to search for the data (SCL) on which to trigger
⚫
after the clock signal (SDA) stays in the idle state for a specified period of time.
After selecting this condition, you can click Timeout, then use the pop-up
numeric keypad or scroll with the mouse to set the idle time. The range is from
8 ns to 10 s.
With CS: if the CS signal is valid, the oscilloscope will trigger when the data (SDA)
⚫
DS8000-R User Guide
D7 D6 D5
Figure 5-16 Sequential Chart of SPI Bus
D4 D3 D2
RIGOL
D1 D0
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