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:
Apr. 10, 1990
Filed:
Sep. 16, 1987
Sakae Itoh, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method and apparatus for fast branching of microcode sequences in a microcomputer. A branch controller provides addresses to a microcode memory and receives addresses and a branch control signal back from the memory for the next microcode to be executed. Prior to determining whether a branch instruction is present at the indicated location in the sequence, the branch controller provides a provisional address to the memory for the next sequential microcode in the sequence assuming that no branching is to occur. Then a determination is made whether a branch instruction is present. If so, the provisional address is changed by inverting one or more address bits to reflect the branching address and the changed address is applied within the same cycle to the memory.