418 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
26 CXPI Triggering and Serial Decode
a Press the Source softkey; then, turn the Entry knob to select the channel for
the signal.
b Press the Threshold softkey; then, turn the Entry knob to select the 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
(Serial 1 or Serial 2).
c Press the Tolerance softkey; then, turn the Entry knob (or press the softkey
again and use a keypad dialog) to specify the tolerance as a percentage of
the Tbit width.
d Press the Baud Rate softkey; then, turn the Entry knob (or press the softkey
again and use a keypad dialog) to match the baud rate of the CXPI signal
from your device under test.
The CXPI baud rate can be set from 9600 b/s to 40000 b/s in 100 b/s
increments.
You must set the baud rate to match your device under test.
The default baud rate is 20 kb/s.
e Select Show Parity to include the parity bit in the identifier field.
When Show Parity is not selected, the upper bit is masked. The parity is still
checked, but it is not displayed unless a parity error occurs.
Parity errors are shown in red.
f Press the Back/Up key to return to the CXPI Serial Decode Menu.
CXPI Triggering
To set up the oscilloscope to capture CXPI signals, see “Setup for CXPI
Signals" on page 417.
When CXPI (Clock Extension Peripheral Interface) is selected as one of the serial
bus decodes, you can trigger on CXPI signals.
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