whitequark[cis] changed the topic of #glasgow to: https://glasgow-embedded.org · digital interface explorer · https://www.crowdsupply.com/1bitsquared/glasgow · code https://github.com/GlasgowEmbedded/glasgow · logs https://libera.irclog.whitequark.org/glasgow · matrix #glasgow-interface-explorer:matrix.org · discord https://1bitsquared.com/pages/chat
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<ldcd[m]> (apologies for the photo of a crt but I don't have any parallel port printers)
<ldcd[m]> I'm able to manage a just over 1ns pulse using the same sorts of ppl crimes
<ldcd[m]> *pll crimes
<ldcd[m]> There's hints of being able to go a little faster but maybe not reliably and I think I'd need to break out a 10MHz common source for the Glasgow and scope to see what's going on
<ldcd[m]> (this is an ETS scope which is why there's fuzz)
<ldcd[m]> I think the level shifter is the limiting factor here
<ldcd[m]> What I'm doing here is xnoring the 48MHz clock with a version delayed through the PLLs, and there's a large band where the pulses go away and I just get these blips
<ldcd[m]> Would be interesting to try on the LVDS port
<ldcd[m]> The blips could also be cross talk with the trigger clock
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<josHua[m]> what are you using as a probe?
<ldcd[m]> 200 ohms at the load into SMA
<ldcd[m]> And then 9dB of attenuation +DC block
<josHua[m]> I achieved a 1.7ns wide pulse using a similar circuit that Catherine came up with
<josHua[m]> nod
<ldcd[m]> What was Cats circuit
<ldcd[m]> Did it exploit the lut mux tree variable delay
<josHua[m]> https://discord.com/channels/613131135903596547/613461005392936961/1255638193840193586 into 500 ohms, on an 800MHz scope. let me see if I can find the program
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<josuaH[m]> I am putting a label in front of a table saying this, and sits behind:
<josuaH[m]> > Change my mind
<josuaH[m]> > A photo of a CRT is a screen shot.
<josHua[m]> also if you need a parallel port printers, use this, hombre2131 (@_discord_334944585195454467:catircservices.org) 's box: https://tomverbeure.github.io/2023/01/24/Fake-Parallel-Printer-Capture-Tool-HW.html
<ldcd[m]> That's what my Glasgows for
<ldcd[m]> Well
<ldcd[m]> Will probably just convince my boss to buy something if I actually need this
<ldcd[m]> It's a work instrument so I'm spending other people's money
<ldcd[m]> Yeah ok that's what's gappenint
<ldcd[m]> *Happening
<josHua[m]> I guess that is true! but if your Glasgow is in use, I suppose.
<josHua[m]> I'm surprised at the poor edge shape of what you captured, I guess
<ldcd[m]> It's like 500ps rise time
<ldcd[m]> The fuzz on the way down is because this is an equivalent time sampling scope
<ldcd[m]> And there's either a bimodal pulse width or an imperfect lock
<ldcd[m]> This thing also probably hasn't been calibrated in a decade
<ldcd[m]> Just salvaged it a week ago
<_whitenotifier-9> [glasgow] neuschaefer synchronize pull request #585: support.endpoint: allow waiting for incoming connection. - https://github.com/GlasgowEmbedded/glasgow/pull/585
<_whitenotifier-9> [glasgow] neuschaefer synchronize pull request #587: protocol.nbd: implement Network Block Device server. - https://github.com/GlasgowEmbedded/glasgow/pull/587
<_whitenotifier-9> [glasgow] neuschaefer synchronize pull request #587: protocol.nbd: implement Network Block Device server. - https://github.com/GlasgowEmbedded/glasgow/pull/587
<_whitenotifier-9> [glasgow] neuschaefer commented on pull request #587: protocol.nbd: implement Network Block Device server. - https://github.com/GlasgowEmbedded/glasgow/pull/587#issuecomment-2226389566
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