Keysight InfiniiVision HD3 Series - SPI Triggering

350 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
28 SPI Triggering and Protocol Decode
• Bit Order — Select the bit order, most significant bit first (MSB) or least
significant bit first (LSB), used when displaying data in the serial decode
waveform and in the Lister.
Notes • SPI triggering and serial decode is included as a standard feature.
• If the decode line does not appear on the display, press the [Protocol Decode] key
to turn it on.
• If the oscilloscope is stopped, press the [Run/Stop] key to acquire and decode
data.
• If the setup does not produce a stable trigger, the SPI signals may be slow
enough that the oscilloscope is Auto triggering. Press the [Mode] key to set the
trigger mode from Auto to Trig'd.
• You can use the horizontal [Zoom] window for easier navigation of the decoded
data.
SPI Triggering
To set up the oscilloscope to capture SPI signals, see "SPI Protocol Setup" on
page 347.
After the oscilloscope has been set up to capture SPI signals, you can then trigger
on a data pattern that occurs at the start of a frame. The serial data string can be
specified to be from 4 to 32 bits long.
1 Select the trigger badge, or from the main menu, choose Trigger > Setup....
2 In the Trigger dialog box, from the Trigger Type drop-down list, select Protocol 1:
SPI or Protocol 2: SPI.
The Trigger dialog box controls unique to the PN: SPI trigger type are:
• Trigger Type — Selects the trigger condition:
• Master-Out, Slave-In (MOSI) Data — Triggers on the MOSI data signal.
• Master-In, Slave-Out (MISO) Data — Triggers on the MISO data signal.
• Base — Selects between Hex or Binary data value entry.
The entered data value appears in both binary and hex formats in a separate
dialog.