Structure and method for producing mask-programmed integrated circuits which are pin compatible substitutes for memory-configured logic arrays
CA 2016755 C · Owner: Xilinx, Inc. · Inventors: Mahoney, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A structure and method for producing mask-configured integrated circuits which are pin compatible substitutes for userconfigured logic arrays is disclosed. Mask-defined routing lines having resistive/capacitive characteristics simulating those of user-configurable routing paths in the user-configurable logic array are used in the mask-defined substitutes to replace the user-configurable routing paths. Scan testing networks are formed in the metal-configured substitutes to test the operability of logical function blocks formed on such chips. The scan testing networks comprise a plurality of test blocks each including three field effect pass transistors formed of four adjacent diffusion …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 14, 1990 and granted August 9, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2012.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.