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. 05, 1995
Filed:
Sep. 15, 1994
Motorola Inc., Schaumburg, IL (US);
Abstract
A cache TAG RAM (25) includes a reduction circuit (39) for comparing match signals from a plurality of exclusive OR logic circuits (33, 34) and provides a hit signal when all of the TAG address bits of a stored TAG address is the same as input address bits. The reduction circuit (39) provides a miss signal when any one or more of the bits of the stored TAG address is not the same as the corresponding bits of the input address bits. In one embodiment, the reduction circuit (39) uses a plurality of transistors (77, 78) coupled to a conductor (75) for discharging the conductor (75) if one of the exclusive OR logic circuits (33, 34) indicates a miss. In another embodiment, the reduction circuit (39') charges the conductor. The comparison can be made using signals having small signal swing at high speed, and a reference voltage is not needed for the comparison.