Technical data

Serial Bus Decoding & Triggering, Search & Navigation, and Segmented Acquisition Labs 4
3000 X-Series Oscilloscopes Advanced Training Guide 81
19 Press the MISO softkey; then select D8 using the Entry knob.
20 Press the (Back) front panel button to return to the previous menu.
21 Press the CS softkey; then press 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) using the
Entry knob.
24 Press the Trigger Setup softkey.
25 Press the Bit softkey; then turn the Entry knob to select the MSB
(left- most bit), which is Bit 0.
26 Press the 0 1 X softkey to select 0 as the trigger logic condition for Bit
0 (MSB).
27 Press the Bit softkey to increment to the Bit 1 position.
28 Press the 0 1 X softkey to select 0 for Bit 1.
29 Repeat Steps #27 and #28 until MOSI Data = 0000 0011.
Figure 56 Decoding a 4-wire SPI serial bus.
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