The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 1995
Filed:
Aug. 05, 1993
Khaled A El-Ayat, Cupertino, CA (US);
Jia-Hwang Chang, Cupertino, CA (US);
Actel Corporation, Sunnyvale, CA (US);
Abstract
In an integrated circuit having a plurality of function modules, each of the function modules having at least two inputs and at least one output. The integrated circuit is user programmable such that interconnections between selected ones of the function modules and input/output pins on the integrated circuit may be made. The integrated circuit further having two states, a first unprogrammed state where none of the interconnections have been made, and a second, programmed state in which selected interconnections have been made. Circuitry for testing the functionality of individual ones of the function modules when the integrated circuit is in the unprogrammed state comprises addressing means for selecting any one of the function modules, data input means for providing a selected logic level to at least one of the inputs of the function module selected by the addressing means, and output-connecting means, responsive to the addressing means, for temporarily connecting the output of the selected one of the function modules to one of the input/output pins on the integrated circuit.