Keysight 4000 X-Series, Руководство по продвинутой подготовке

Страница: 90 / 170

90 4000 X-Series Oscilloscopes Advanced Training Guide
4
Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
27
Tap the Bit softkey and enter 1 in the keypad.
28
Tap the 0 1 X softkey to select 0 for Bit 1.
29
Repeat Steps #27 and #28 until MOSI Data = 0000 0011.
Your scope should now be triggering on MOSI data = 03
HEX
with this byte shown
at center-screen similar to Figure 57 . Let’s now capture a very long stream of SPI
traffic and then manually search through the captured and decoded record.
30
Press the
[Serial]
front panel key.
31
Tap the Lister softkey; then set the Window menu to select Half-Screen .
32
Set the scope’s timebase to 20.00 ms/div .
33
Press
[Run/Stop]
to stop repetitive acquisitions.
34
Tap the Scroll Lister softkey; then turn the Entry knob to manually scroll through
the lister table. You can also scroll using the scroll bar on the right of the lister
window.
As you scroll through the data, note that waveforms “track”. This means that the
frame that the arrow points to in the lister table corresponds to the waveforms that
are positioned at center-screen. If you want to zoom in on a particular SPI frame of
Figure 57 Triggering on MOSI data = 03
HEX
.