Keysight 4000 X-Series, Advanced Training Manual

Page: 89 / 170

Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs
4
4000 X-Series Oscilloscopes Advanced Training Guide 89
17
Tap the MOSI softkey; then select D9 .
18
Press the (Back) front panel button to return to the previous menu.
19
Tap the MISO softkey; then select D8 .
20
Press the (Back) front panel button to return to the previous menu.
21
Tap the CS softkey; then tap the ~CS softkey; then select D6 using the Entry
knob.
22
Press the
[Label]
front panel key to turn on the scope’s default labels.
Your scope should now be decoding the MOSI and MISO serial data lines similar to
Figure 56 . However, the scope is not yet triggering on these signals. The scope
should be randomly auto triggering because the default trigger condition is to
trigger on a rising edge of channel-1. But there are no signals present on the
channel-1 input. Let’s now set up the scope to trigger on a MOSI data byte equal
to 0000 0011 (03
HEX
).
23
Press the
[Trigger]
front panel key; then select Serial 1 (SPI) .
24
Tap the Trigger Setup softkey.
25
Tap the Bit softkey and enter 0 in the keypad.
26
Tap the 0 1 X softkey to select 0 as the trigger logic condition for Bit 0 (MSB).
Figure 56 Decoding a 4-wire SPI serial bus.
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