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. 16, 1998
Filed:
Jan. 25, 1996
Kazuhiko Hara, Sanda, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
First and second circuits store therein source and destination operand addressing information from an instruction code as input information of a main decoder, respectively. A third circuit stores therein information other than operand addressing information from the instruction code as input information of the main decoder. A predecoder analyzes the instruction code and controls states of the first, second and third circuits. A first selector determines which information is input to the main decoder, from the first circuit, the second circuit or the third circuit. A processing selecting circuit causes the first selector to select information for each instruction, in a basic sequence of the first circuit, the second circuit and then the third circuit. The processing selecting circuit controls the first selector so that, if a state of at least one of the first and second circuits indicates that `processing is not required`, the circuit of the state of the indication is not selected and a subsequent circuit is selected instead. The main decoder obtains the information from the first, second and third circuits and controls each component of the central processing unit.