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. 24, 1997
Filed:
Apr. 06, 1994
Mamoru Ohba, Hitachi, JP;
Shigeki Morinaga, Hitachi, JP;
Mitsuru Watabe, Katsuta, JP;
Hiroyuki Kida, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a coprocessor system having a central processing unit (CPU), a floating-point processing unit (FPU) and a memory (RAM), coupled with each other through buses, when the CPU issues a save command to the FPU, the FPU discriminates the attribute, i.e., a long command or a short command, of a current command executed by the FPU upon receipt of the save command and the internal status thereof. In response to the discrimination result, the FPU interrupts the execution of the current command at once to start the execution of the received save command, when the current command is a long command, and the FPU executes the received save command after the completion of execution of the current command, if the current command is a short command. The attribute of a command is determined in advance on the basis of a time necessary for executing the command and a predetermined criterion provided therefor.