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Subscripts in pin names

Discussion in 'CAD' started by Joel Kolstad, Jun 21, 2007.

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  1. Joel Kolstad

    Joel Kolstad Guest

    In data books, the draftsmen who create the symbols will show names like "VCC"
    with the "CC" subscripted as you'd expect. Does anyone know of a schematic
    capture tool that supports that use of sub- and super-scripts in pin names?

    ---Joel Kolstad
  2. Mak

    Mak Guest

    In majority of the cases, subscripts or superscripts are appended as
    text next to V, so VDD or VCC would work just fine. Care must be taken
    in the cases where some chips have VCC and VDD as power connections
    and they are hidden in the schematic. You should explicitly connect
    VCC, VDD with your power source which comes out of a regulator like
    V3_3 or V5_0 or direct input as V5_0

    Hope this helps

  3. Joel Kolstad

    Joel Kolstad Guest

    Sure, they "work" just fine, but it's too bad that CAD software doesn't make
    it easy to have them *look* the way they were intended as well.
    These days I never hide power pins... it's quite uncommon today to have
    designs that don't have multiple rail voltages running around.

  4. Marra

    Marra Guest

    It would be a pretty stupid engineer who didnt know what VCC was if it
    wasnt in superscript !
    I use up to 8 character net names in my software and it works fine.
  5. Joel Kolstad

    Joel Kolstad Guest

    You're missing the point: Just because one can get by without subscripts,
    lower case, (effectively) unlimited length pin names, etc. is no reason to not
    support them in a piece of software. Heck, people got along just fine on PCs
    when file names were restricted to upper-case only, 8.3 characters, no spaces,
    etc... but I'd wager that most people wouldn't want to go back to that system,
    now that they're used to being able to do more.
  6. Marra

    Marra Guest

    But you have to draw a line somewhere, you cant go on adding functions
    and expansions indefinitely.
    At some point you have to sell the software.
    I am not Microsoft just a one man band.
    Software is like that fairground game where you hit a man on the head
    with a hammer and a little later another man pops up somewhere else.
    Thats a bit like debugging. Keep it simple and you shouldnt get as
    many bugs.
    Get into bloatware and you will never meet deadlines or in some cases
    ever finish coz the plug has been pulled.
  7. Joel Kolstad

    Joel Kolstad Guest

    Sure you can. And keep in mind that, if the features are truly useful, if you
    don't add them, sooner or later your competitors will.
    Yes, version 1.0. Then you sell version 2.0, 3.0, 3.1, then 95, 2000, XP,
    Vista... oh wait, that's Microsoft, isn't it? But everyone else does much the
    same thing these days.
    I'd modify that to Einstein's "Everything should be made as simple as
    possible, but no simpler."

    I can take programs I wrote in C back in the 1980s and re-write them today in
    something like Python in 1/4 the time. Are they bigger? Oh yeah, absolutely.
    Are they slower? On a number of clock cycles basis, yes they are --
    significantly so. Are they still good, "solid" bits of code? Sure. What
    still matters most? Development time and ease of maintainability. Relaxing
    the standards for memory footprint and number of raw CPU clock cycles helps
    both of these considerably.
    Agreed, this is a significant danger. Good companies often prioritize
    software development into features the software "must" have, "would be really
    great to have," and "appeals to some obscure user in Pocatello" categories.
  8. JeffM

    JeffM Guest

    You forgot to mention the codebase fork. ;-)
    When your corp has so many (acquired) products
    that some compete with others
    and you make decisions about which ones to abandon,
    then, yeah--an ECAD corp looks a lot like the Borg.
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