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:
May. 16, 1995
Filed:
Aug. 09, 1993
James L Broseghini, Austin, TX (US);
James G Viot, Austin, TX (US);
Donald H Lenhert, Manhattan, KS (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and apparatus for generating pseudo-random numbers or for performing data compression in a data processor (12). In one form, the present invention generates pseudo-random numbers which are used to provide scan input data bits during built-in-self-test (BIST) scan testing. The present invention then performs data compression on the scan output data received back from the circuits under test (73-75). In one embodiment, the BIST scan testing of data processor (12) is performed in a special 'background self-test mode'. Central processing unit (CPU) 20 is used to generate the pseudo-random numbers and to perform the data compression. CPU 20 also functions as a standard CPU when in a normal operating mode.