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Pocket-Sized 6 GHz 1 TS/s ET Scope

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joeqsmith:

--- Quote from: SJL-Instruments on January 24, 2024, 01:46:54 pm ---We've traced down the problem to a CDC bug in the FPGA. Patching this and running overnight, we took 10 million samples with no errors (no software filtering). This seems promising so far. We'd like to add CRC checks and test to a higher confidence level before declaring the problem "solved," but we'll be in contact shortly about the firmware upgrade procedure.

--- End quote ---

I'm surprised you would have CDC problems with the S7.  I would have thought the tools would do a decent job identifying these problems.

Good to hear you found it.  Send the tools and I will upgrade the hardware.  I'll postpone working on the review until it's resolved.   Consider sending the tools to SignalPath channel as well. 

joeqsmith:
While digging out my old Xilinx programming adapter for you,  I thought why not set up some simple circuits with an FPGA to make use of the 4 channels.  Shown is a pseudo random sequence generator.  Channel 1 is the clock/2,  Channel 2 is the clock,  Channel 3 in the enable, Channel 4 is the SRS.    Looking at channel 1 and comparing 2.5.3 and the 3rd revision of 2.5.5.  Notice first that both show unstable at the 3rd low state.  The latest shows the 1st & 3rd but the amplitude is lower.   

So there are cases where the glitches can happen after 12ns and happen often and the new filtering may have been causing more problems.  I guess we wait until the updates and see if it solves all these little oddities. 

joeqsmith:
While I can confidently state that this particular FPGA is not capable of producing a 4 voltage level output, the scope shows otherwise.   Could very well be caused from your timing violation. 

You can almost make out an eye pattern..

SJL-Instruments:
We've just sent you the updated firmware files, and a pre-release draft of the firmware update documentation. When the Tag-Connect cable arrives, let us know if it fixes the glitches you're seeing.

We're continuing to test the firmware fix, and will release it publicly once we're confident the problem is resolved (likely sometime next week). We've also paused all sales until then.


--- Quote from: joeqsmith on January 25, 2024, 01:25:58 pm ---You can almost make out an eye pattern..

--- End quote ---
There's a brightness slider in the extended channel settings that might help make the pattern more visible.

joeqsmith:
Personally, I applaud your decision. 

I'll let you know once the cable shows up.   

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