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:
Dec. 31, 1996
Filed:
Jun. 07, 1995
Chenwei J Yin, Richardson, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An integrated circuit includes read/write memory and non-memory circuitry. A detector generates a count of the number of bits of each data words recalled from the memory having a predetermined logic state. An adder accumulates the count for plural data words over a period of time into a count register. The integrated circuit may be tested by lading each data word of the read/write memory with a first logic state and repeatedly addressing said read/write memory circuitry with a predetermined number of each possible address in sequence. The resulting count in the count register is compared with an expected count. The integrated circuit may also be tested by loading a predetermined addressable storage location with another logic state while loading all other addressable storage locations with the first logic state and repeatedly addressing the predetermined addressable storage location. The resulting count in the count register is compared with another expected count. The non-memory circuitry is preferably digital to analog converters, whose outputs may be compared to test their operation.