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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 20 Dec 2020
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      Realised again that some of my electronics tinkering followers may not have watched this incredible talk. It fundamentally changed the way I think about power and signals in circuits. "Where is the energy in a PCB? It's in the fiberglass."https://www.altium.com/live-conference/altiumlive-2018-annual-pcb-design-summit/sessions/extreme-importance-pc-board-stack-up …

      10 replies 56 retweets 297 likes
    2. doragasu‏ @doragasu 23 Dec 2020
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      Replying to @gsuberland @marcan42

      Got to see the talk, but AFAIK that's true only for high frequency (specially digital circuits). For low frequency analog for example energy is in the copper (or maybe I have been mistaken all my life).

      2 replies 0 retweets 2 likes
    3. doragasu‏ @doragasu 23 Dec 2020
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      Replying to @doragasu @gsuberland @marcan42

      In fact when designing high frequency circuits, you must always pay attention to the current returns, or you will screw signal integrity.

      1 reply 0 retweets 0 likes
    4. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 23 Dec 2020
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      Replying to @doragasu @marcan42

      It's covered in the talk but the critical part is that many people don't realise that almost every digital part in existence now has >10MHz frequency components because of short rise/fall times.

      2 replies 0 retweets 1 like
    5. michael wave‏ @XMPPwocky 23 Dec 2020
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      Replying to @gsuberland @doragasu @marcan42

      yeah this bit me recently when I figured I'd be fine with a 3-foot ribbon cable for a JTAG connector to a device- I could always just drop the clock speed if it was an issue nope! turns out that device drives TDO with the strength of a thousand suns, coupling into the adjacent

      1 reply 0 retweets 2 likes
    6. michael wave‏ @XMPPwocky 23 Dec 2020
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      Replying to @XMPPwocky @gsuberland and

      TCK and causing double-clocking

      1 reply 0 retweets 0 likes
    7. michael wave‏ @XMPPwocky 23 Dec 2020
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      Replying to @XMPPwocky

      even at speeds of 10s of khz- because the rise/fall times were what actually mattered

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @XMPPwocky

      Yeah, in retrospect I bet this is related to the problems I had playing with timings to drive LED strips with Glasgow. Slowing things down barely helped with longer cables. The frequencies aren't too high, but the edge rates...

      8:53 PM - 23 Dec 2020
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      • michael wave
      0 replies 0 retweets 1 like

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