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New Scope Demoboard from Batronix

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pdenisowski:

--- Quote from: Martin72 on June 07, 2023, 08:22:33 pm ---Serial decodings:
Did you get a "jitterfree" stable signal on your scope ?

--- End quote ---

Yes, very stable.  I can make a short video if you like.

Martin72:
Would be nice ! :-+

pdenisowski:

--- Quote from: Martin72 on June 07, 2023, 10:24:42 pm ---Would be nice ! :-+

--- End quote ---

Okay, I think I know what you mean by "jittter" on the signal.  The decode is stable, but there does appear to be some "jittter" in the waveforms.  I tried a rising edge trigger on the clock signal (as shown in the video) as well as a falling edge trigger on CS / SS and got the same behavior.  The MXO4 also supports a protocol "Start of Frame" trigger which, unsurprisingly, also showed the same behavior.



I think the next step would be to analyze the individual channels (CS and CLK) and plot a jitter histogram of each one.  I could also rebuild the circuit that I used for my "Understanding SPI" video and check if I see the same behavior.

I should note however that this "jitter" doesn't affect my ability to decode the SPI signal.

Martin72:
This is way more stable than mine, I´ll make a short clip in the next days.
And: As I mentioned before, my siglent decode it correctly, you can see it best when in stop mode.

tautech:

--- Quote from: Martin72 on June 07, 2023, 08:22:33 pm ---Serial decodings:
Did you get a "jitterfree" stable signal on your scope ?

--- End quote ---
That can only be a result of trigger settings, if using a serial trigger then it's triggering on duplicate bits in a packet or successive packets carrying the same bit.
If using an edge trigger in the screenshot below from STB-3 and SDS1204X HD Holdoff longer than packet length needs be applied to obtain rock solid triggering.
Here the packet header never changes however the payload does with each packet.

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