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:
Apr. 02, 1991
Filed:
Dec. 07, 1988
Robert C Martin, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An integrated circuit (10) includes at least one module (12) of operation circuits and also has other operation circuitry. The module (10) has a plurality of operation circuit terminals (98) each of which is operable to be selectively coupled to an external operation circuit terminal (86) or to a respective test terminal (96) by a multiplexer (76). A plurality of peripheral cells (30-40) are provided for connection to conductors external to the chip (10). Each cell (30-40) is bidirectionally coupled to a respective test terminal (42) and is undirectionally coupled to operation circuitry (134, 142, 158, 160) of the chip (10) such that test patterns of a testing program corresponding to the module (12) may be input into selected ones of the cells (30-40). Resulting output signals may be obtained from selected ones of the cells (30-40) that will be unaffected by operation circuitry on the integrated circuit chip exterior to the module (12).