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 (VCAR) How to route mosfet diffusion regions? 

Last post Tue, Jul 21 2009 7:31 PM by tkhan. 1 replies.
Started by mike207 21 Jul 2009 07:04 PM. Topic has 1 replies and 1029 views
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  • Tue, Jul 21 2009 7:04 PM

    • mike207
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    • Joined on Tue, Jul 21 2009
    • Posts 1
    • Points 20
    (VCAR) How to route mosfet diffusion regions? Reply

     Hi all:

    How can I make the VCAR route the transistor diffusion regions (S D) by automatically adding contacts and using metal 1 to finish the job instead of directly using diffusion layer as routing layer which is obviously wrong?

    Thank you!

    • Post Points: 20
  • Tue, Jul 21 2009 7:31 PM

    • tkhan
    • Top 50 Contributor
    • Joined on Sat, Aug 16 2008
    • Toronto, Ontario
    • Posts 159
    • Points 2,220
    Re: (VCAR) How to route mosfet diffusion regions? Reply

    I found this to be very frustrating also, as the autorouter would do a lot of routing on poly and diffusion. The best solution I've come up with is to draw a poly_m1 autocontact at the end of gates or extend the m1 over diffusion manually then let the autorouter do its job. Of course this isn't convenient if you have a lot of transistors to route. I'm not familiar with writing the ruleset since my pdk came with a set of rules already, but you might want to look through /ICC/doc/iccausr/iccausr.pdf on how to write the rules yourself.

    • Post Points: 5
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Started by mike207 at 21 Jul 2009 07:04 PM. Topic has 1 replies.