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. 17, 1995
Filed:
Sep. 08, 1994
David W Howard, Cherry Hinton, GB;
Advanced RISC Machines Limited, Cambridge, GB;
Abstract
A memory circuit, in which test data are compared with stored data, comprises a plurality of memory cells each having two complementary data outputs indicative of a respective stored bit of the stored data. The two complementary outputs are selectively interchanged, in response to a respective test bit of the test data. An output signal is then generated (e.g. by a sense amplifier) in response to the relative polarities of the two complementary data outputs. The output signal is indicative of whether the stored bit is equal to the test bit. Where a multi-bit word is stored in a plurality of the memory cells, the output signals generated by a comparison of each stored bit of the multi-bit word and respective bits of the test data are combined by, for example, an AND gate. The output of the AND gate indicates whether the test data matches the stored multi-bit word.