Zip CPU @zipcpu

FPGA design engineer and blogger, placing particular emphasis on test and formal verification zipcpu.com Gisselquist Technology, LLC, Joined January 2017

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Zip CPU @zipcpu

4 days ago

For those who've been following, here's what the we discovered this morning: The fault took place in a "new" BIST circuit, added to an older design. The "fix" will be to extend the size of the synchronous FIFO. (In hindsight, it should've never been that small.)

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Zip CPU @zipcpu

4 days ago

Hypothesis: Confirmed.

bradipao @bradipao

4 days ago

Hypothesis: Confirmed.

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Zip CPU @zipcpu

5 days ago

Today's bug, revealed in post (ASIC) layout simulation: writing values ...,A,A,B,B,C,C,C,C... to a FIFO, and reading out values ...,A,A,B,C,C,C... from the FIFO. The FIFO is fully formally verified. It had no bugs prior to the (ASIC) place and route. As for the cause? I'm not…

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The Lunduke Journal @LundukeJournal

a week ago

I wonder how many Conservative speakers have stopped participating in Tech Conferences because of the politics? Off the top of my head I can think of a dozen or so prominent speakers, who you’ll now never find on a conference schedule.

Uncle Bob Martin @unclebobmartin

a week ago

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Zip CPU @zipcpu

3 weeks ago

Okay, so ... my Vivado simulation failed, so I'm running through the log and find tons of this irrelevant warning I understand the Verilog standard requires this warning, but that doesn't make it useful.

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Zip CPU @zipcpu

3 weeks ago

Allow me to share a verse that has always put the fear of God in me. I do not wish to be deceived. Then, if Prov 14:12 wasn't enough to get your attention, God essentially repeats the thought again in Prov 16:25

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Zip CPU @zipcpu

3 weeks ago

My family and I mourn the senseless murder of Charlie Kirk. Many know that I am a Christian. Many consider that "right wing" or perhaps even "radical". I consider it simply "Christian". Charlie never knew me, yet I often heard him championing ideas I agree with. I enjoyed…

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Zip CPU @zipcpu

3 weeks ago

Engr: Sir, test case XYZ doesn't pass Mgr: Then remove it from the report. But ... shouldn't a failing test case be an important part of the systems test report?

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Zip CPU @zipcpu

3 weeks ago

After two decades as an engineer in military service, one thing I enjoyed collecting were stories of misleading research: proving something works when it doesn't, arguing there are significant gains in a technology when the results aren't really all that significant…

Vigilant Fox 🦊 @VigilantFox

3 weeks ago

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Zip CPU @zipcpu

4 weeks ago

@lel0uch_vb Thank you, you are right, I grabbed the wrong section of the file. This would be where I see multiple drivers. Both STATUS and DATA appear multiply driven.