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:
Jul. 10, 2001
Filed:
Aug. 18, 1998
Hideyuki Kabuo, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In addition to a register file having four general-purpose registers each for storing data, an arithmetic and logic unit for executing an addition instruction, a subtraction instruction, or the like, and a multiplier unit for executing a multiplication instruction, there are provided a controller and a substitute register for storing only data representing the result of operation performed by the multiplier unit in place of any of the four general-purpose registers in the register file. The controller controls the writing and reading of data in and from the register file and the writing and reading of data in and from the substitute register based on a multiplication tag indicative of the one of the four general-purpose registers in place of which the substitute register stores the data representing the result of multiplication and on a multiplication execute flag indicative of whether the data stored in the substitute register is effective or ineffective.