Keysight InfiniiVision HD3 Series - Page 348

348 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
28 SPI Triggering and Protocol Decode
Signals Serial Peripheral Interface (SPI) signals setup consists of: connecting the
oscilloscope to a clock, MOSI data, MISO data, and framing signal, then setting
the threshold voltage level for each input channel, and finally specifying any other
signal parameters.
The SPI protocol decode mode Signals subtab has these controls for setting up the
signals:
• Clock, Threshold, Polarity — For the SPI clock signal:
• Select the channel connected to the SPI serial clock line.
The CLK label for the source channel is automatically set.
• Enter the clock signal threshold voltage level.
The threshold voltage level is used in decoding, and it will become the
trigger level when the trigger type is set to the selected serial decode slot.
• Select the Rising or Falling edge for the selected Clock source.
This determines which clock edge the oscilloscope will use to latch the serial
data.
• MOSI, Threshold — For the SPI Master-Out Slave-In signal:
• Select the channel that is connected to a SPI serial data line. (If the channel
you selected is off, switch it on.)
The MOSI label for the source channel is automatically set.
• Enter the MOSI signal threshold voltage level.
The threshold voltage level is used in decoding, and it will become the
trigger level when the trigger type is set to the selected serial decode slot.
• MISO, Threshold, Delay — (Optional) For the the SPI Master-In Slave-Out signal:
• Select the channel that is connected to a second SPI serial data line. (If the
channel you selected is off, switch it on.)
The MISO label for the source channel is automatically set.