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:
Jan. 04, 1994
Filed:
May. 30, 1990
Chikako Ikenaga, Hyogo, JP;
Hideki Ando, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An arithmetic and logic processor includes a register file structure wherein each procedure to be processed has assigned thereto a predetermined number of registers referred to as register window. The processor further includes circuitry for comparing a predetermined constant LENGTH with the difference between the register window currently utilized by a procedure under execution and the base address of the register file, and circuitry responsive to the comparing circuitry output to detect when data should be transferred on a window basis to or from the register file from or to a stack memory for saving the register file contents, and circuitry responsive to the decision circuitry output to perform data transfer between the register file and the stack memory. According to such circuitry, overflow and underflow of the register file can be greatly suppressed to improve processing speed of the processor.