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:
Oct. 27, 1992
Filed:
Jul. 31, 1990
Applicant:
Inventors:
Randy C Steele, Folsom, CA (US);
Bruce A Doyle, Flower Mound, TX (US);
Assignee:
SGS-Thomson Microelectronics, Inc., Carrollton, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
371 222 ; 371 213 ;
Abstract
A shift register used to shift programming and test data into a programmable logic device is modified so that each bit thereof can be directly set or reset. Control signals can be used to directly place the required test patterns into the shift register. A memory connected to the shift register, and associated logic, provides a means for testing whether data was accurately written to the array without shifting any data off of the device.