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  1. #1
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    New fabrication of an old nmos processor from the 80s in a new semicond. technology

    Hello,

    I am searching for CAD-layouts and/or schematics circuits of old microprocessors for Si-NMOS technologies. Maybe you have an idea where we can find a published circuit, which can be downloaded in the internet.

    The processor can be very old fashion from the 1980s. I am working at the university as PhD-student and we plan to develop a simple processor in a N-type InP-heterostructur technology.

    I would be very pleased if you can sent my any helpful links
    Thank you very much
    Reinhard

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  2. #2
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    Re: New fabrication of an old nmos processor from the 80s in a new semicond. technolo

    Back in the late '80s / early '90s I knew a guy out of TRW
    Redondo Beach who told me about InP digital chips they were
    doing, with 200GHz main clock.

    While detailed design databases are probably still locked up
    IP-wise maybe your university could make a deal with the
    original vendor, or its successors, for IP access. However
    you should expect that the design schematics are paper
    and some reel tape archives that you can't find a reader
    for (NMOS uPs are so '70s).

    What about the notion of taking one of the open source
    uP/uC projects, pick one that looks good, simple and able
    to be speed-tweaked the way you want, and attack the
    low level logic gate designs first, then go bottom-up? It's
    not like there's a big difference between a depletion-load
    inverter and CMOS (more, perhaps, in DFF design where
    a HBT doesn't make so good a pass-switch for a TINV-
    style DFF, but I'm sure you can find examples that work).

    I might recommend you also consider what kind of processor
    would actually useful in a >100GHz-clocked system, a general
    purpose small processor probably isn't it. But a custom DSP,
    suited to radio front end functions, sure could be.


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