Agilent Technologies 54621A, User Manual, Page: 99 / 276

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Triggering the Oscilloscope
To use SPI triggering
To use SPI triggering
Serial Peripheral Interface (SPI) trigger setup consists of connecting the
oscilloscope to a clock, data, and framing signal. You can then trigger on a data
pattern during a specific framing period. The serial data string can be specified
to be from 4 to 32 bits long.
When you press the Settings softkey, a graphic will be displayed showing the
current state of the frame signal, clock slope, number of data bits, and data bit
values. Press the
Signals
softkey in the
Settings
menu to see the current source
channels for the clock, data, and frame signals.
• Press the
More
key in the Trigger section of the front panel, rotate the
Entry knob until SPI is displayed in the Trigger softkey, then press the
Settings softkey to display the SPI trigger menu.
Assign
channels
# data bits
in string
Data bit
select
Set all
data bits
to value
Trigger level
or threshold
Currently selected Clock,
Framing, or Data channel
SPI trigger
Return to
previous menu
Data bit
value
Data string
values
Graphic showing
current state of the
SPI trigger setup