I had SPI issue, the waveform is good with other scope(LeCroy) but malfunction.
But when I connect the SCK with Saleae probe, then the function suddenly turn to PASS.
What’s the Saleae probe inside?
Is that meaning I connect SCK with pull-down?
Could anyone comment on this?
@alex925chen Can you confirm which exact Saleae Logic model you own?
You can take a look at the datasheet for your specific device to get the input impedance values.
It would also be good to know the following:
- How is your Saleae Logic connected to your DUT?
- How are your SPI signal traces laid out on your PCB?
- What is the input impedance of the LeCroy scope probes that you are using? It might be good to compare to ours to see what might be causing the difference.
- Does your DUT pass without any probes attached?