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:
Jun. 08, 1993
Filed:
Nov. 07, 1991
Hitachi, Ltd., Tokyo, JP;
Abstract
A cache memory apparatus made up of a memory cell array (300) and a match detection circuit is disclosed. The match detection circuit produces a detection signal related to whether a search data coincides with a data read out of the memory cell array (300). The match detection circuit applies complementary signals (d, d) of the data read from the memory cell array (300) to the bases of bipolar differential transistors (10, 11), the gates of a pair of field effect transistors (16, 17) are supplied with complementary signals (a, a) of the search data, and the bases of a pair of emitter-follower transistors (12, 13) are connected to the collectors of the bipolar differential transistors (10, 11), thereby producing a detection signal (HITO) from the jointly-connected emitters thereof.