jrg@Apple.COM (John R. Galloway) (05/12/89)
In looking to CAD systems a big question seems to be "where do the models come from?" Read behavioral, logic, and ciruit model evey place I put model below: 1) Who writes these, the CAD vendor or the IC vendor? and how does the CAD user get them, through some independent source or their specific CAD vendor? 2) How big are they? Obviously this depends on circuit complexity but for some example chips (NAND gates, ALU, Micro processor, etc) how big? 3) It seems to me that the obviously ideal situation would be to have a model repository that a CAD system could call up to down load lists of available parts, and specific models in some standard format for those parts of interest. Does this sort of thing exist? Is it a good idea? Would CAD and IC vendors support it? This seems like a potential money making service, one place for IC vendors to send models to and one place for users to get them from. I really like it. Any investors out there? 4) I presume that some simulators get their high speed or other neat featuers from a proprietary model definition, for those systems can such a proprietary definition be generated automatically from a standard format model? 5) Is that a standard format for representing a model (remember that means B, L, and C definitions). 6) What about modeling things in the design that are not really devices like buses (and the effect of other cards on the bus) or comm lines, or disks, or video sources, or... How is that handeled now? apple!jrg John R. Galloway, Jr. contract programmer, San Jose, Ca These are my views, NOT Apple's, I am a GUEST here, not an employee!!