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SDS5000X Series Digital Oscilloscope User Manual
120 / 236 W W W. S I G L E N T. C O M
16.3 SPI Trigger and Serial Decode
The following sections describe SPI trigger and decode: "SPI Signal Settings",
"SPI Trigger" and "SPI Serial Decode".
16.3.1 SPI Signal Settings
Connect the CLK, MOSI, MISO and CS signals to the oscilloscope and set the
mapping relation between channels and signals. Then set the threshold level of
each signal. The process of specifying the source and threshold is similar to
"I2C Signal Settings".
CLK
In addition to specifying the source and the threshold level, for CLK signal it is
also necessary to specify the Edge Select.
Rising– Data latched on rising edge of the clock.
Falling– Data latched on falling edge of the clock.
The user can select the edge according to the actual phase relationship
between the clock and data of the SPI bus. Referring to the following figure,
when the falling edge of the clock is aligned with the data, the rising edge is
selected to latch the data. When the rising edge of the clock is aligned with the
data, the falling edge is selected to latch the data.
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