Agilent Technologies DSO-X 4022A, User Manual

Page: 425 / 488

I2C/SPI Triggering and Serial Decode
25
Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide 425
To set up the oscilloscope to capture SPI signals, use the Signals softkey
which appears in the Serial Decode Menu:
1
Press
[Label]
to turn on labels.
2
Press
[Serial]
.
3
Press the
Serial
softkey, turn the Entry knob to select the desired slot
(Serial 1 or Serial 2), and press the softkey again to enable decode.
4 Press the Mode softkey; then, select SPI trigger type.
5 Press the Signals softkey to open the SPI Signals Menu.
6 Press the Clock softkey to open the SPI Clock Menu.
In the SPI Clock Menu:
a Press the Clock softkey; then, turn the Entry knob to select the
channel connected to the SPI serial clock line.
The CLK label for the source channel is automatically set.
b
Press the
Threshold
softkey; then, turn the Entry knob to select 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.
c Press the slope softkey ( ) to select rising edge or falling edge for
the selected Clock source.
This determines which clock edge the oscilloscope will use to latch
the serial data. When
Display Info is enabled, the graphic changes to
show the current state of the clock signal.
7
Press the
MOSI
softkey to open the SPI Master- Out Slave- In Menu.