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:
Feb. 07, 2006
Filed:
Sep. 25, 2001
Akimitsu Shimamura, Kyoto, JP;
Akimitsu Shimamura, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A computer system that can be operated by a clock frequency higher than the clock frequency by which the critical path instruction is executed correctly. The pipeline is driven at a high clock frequency higher than the clock frequency by which critical path instruction can be executed correctly. The computer system includes a high frequency ALU being operated by the pipeline clock frequency, and at least two low frequency ALUs being operated by the low clock frequency by which the critical path instruction is executed correctly. Each instruction of the execution stage is inputted to the low frequency ALUs alternately and each executes the critical path instruction in two machine cycles. If the high frequency ALU can execute an instruction correctly, the output of the high frequency ALU is selected as the execution result of the pipeline execution stage, and if the high frequency ALU cannot execute an instruction correctly, the output of a low frequency ALU which is in charge of the same instruction is replaced as the execution result of the pipeline execution stage.