At 08:44 AM 9/11/2010, you wrote:
Steven,
Thanks. I saw the basic set in the manual and will start to work on those.
Is it possible to extend the library? There are a couple of basic gates I
would like to add like a 3 input xor/xnor and some nand gates that have
active low inputs. If these could be added as "standard" it would reduce
the number of layers in the logic.
Also, if I follow the tutorial on the CMOSedu site, will the standard set of
design rules be portable to MOSIS or will I need to get a copy of the rules
first. I have a copy of Weste & Harris that has the rules in table format
but have not compared them to the rules in Electric. I was looking using
the SCMOS or SUBM rules. I still have a ways to go before this is really
important, but would like to start out in the right direction at least.
The default Electric technology, "mocmos" has all of the variations
of MOSIS rules (Deep, SCMOS, and Submicron). Use "Technology
Preferences" to change the technology characteristics.
I don't know how easy it would be to add new standard cells to the
Silicon Compiler set in the manual.
Finally, one other problem with the silicon compiler is that it is 15
years old and dates to a time when standard cells were laid out in
rows with routing channels inbetween. Now routing goes on top and
there is no need for a separate channel. So the silicon compiler wastes space.
-Steve
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