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(VCAR) How to route mosfet diffusion regions?

mike207

 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!

  • tkhan

    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.

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