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. 18, 1989
Filed:
Mar. 12, 1986
Abstract
The control unit detects the errors concurrently with normal microinstruction execution through suitable internal checking circuits and a determined microinstruction allocation in the memory. Microinstructions comprise additional fields (CS, FS) carrying the encoding, in Modified Berger code, of the allocation address of the microinstruction itself and of the following one. The microinstructions of destination of conditional jumps are allocated so that their codes are related to each other by simple logic relationships which are then reproduced by an internal circuit (CSM). The two fields, the one of the next microinstruction being duly delayed, are then compared and possible differences represent unidirectional and incorrect sequencing errors. The other errors are detected through particular implementations of some internal circuits (STK1, INC1) and duplication of others (RCT, SEL).