solworth@acf4.UUCP (03/14/84)
The tools from Berkeley use an old version of the simulator written by Chris Terman now at MIT. A more accurate simulator, rsim is available from Chris directly, or can be obtained through the U. of Washington VLSI Consortium. The advantage of going to U of W is that the '.sim' formats are different, and U of Wash will give you (in addition to the Berkeley and MIT release) conversion programs to go between the two formats. Another simulator which is available is MOSSIM, developed by Randal Bryant, now at Caltech. This simulator requires a MAINSAIL liscence available for $250 to universities ($10K to others). Jon Solworth New York University
will@rti.UUCP (03/19/84)
I'm EXTREMELY sorry to have posted this to a non-existent newsgroup, but I swear
'net.vlsi' was listed in our ngfile. Anyway, here goes again (in the right
newsgroup this time (I hope)).
Here at RTI, we do a lot of circuit extraction and simulation of CIF format
files using the Berkeley CAD tool software (caesar, mextra, esim, and the
like). We've run into a problem with esim: it doesn't simulate this three-
transistor XNOR gate correctly in all cases. This is the circuit:
o Vdd
|
----
----| | n-depletion
| ----
|--------O--------------- output
|
input ----o------ --------------|------------- -----o---- input 2
1 | |___| |___| |
| --- --- |
| | | |
| |______________________________|______|
|______________________________________|
n-enhancement n-enhancement
It's an NMOS gate that has a Vdd connection, but no ground connection.
We've been using the 1980 version of esim. What I'd like to know is
Is there an updated version of "esim" that can handle this
gate, and can we get a copy?
Is there any other public-domain or reasonably-priced
piece of software out there that can do circuit simulation
using the output of the "mextra" circuit extraction program?
Thanks in advance for any and all answers. I'm getting a bit desperate!
William Gwaltney Jr.
decvax!mcnc!rti!will