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:
Mar. 16, 1993
Filed:
Jun. 28, 1990
Russell W Guenthner, Glendale, AZ (US);
Bruce E Flocken, Glendale, AZ (US);
Ronald E Lange, Glendale, AZ (US);
Bull HN Information Systems Inc., Phoenix, AZ (US);
Abstract
In a Central Processing Unit (CPU) incorporating a Basic Processing Unit (BPU) which includes an address and execution (AX) unit, a decimal numeric (DN) unit and a floating point (FP) unit and also incorporating a cache unit situated logically intermediate the BPU and system memory, BPU data manipulation errors are sensed by duplicating each of the AX, DN and FP chips (i.e., duplicating the BPU) and performing all BPU data manipulation operations redundantly. The outputs from the duplicate BPUs are placed on respective master (MRB) and slave (SRB) result busses which are coupled to the cache unit, and the results are compared, byte-by-byte in the cache unit. If the results are not identical in each byte of the result, the individual chip handling the byte in the cache unit and detecting the no-compare condition issues an individual error signal, and appropriate steps to remedy or otherwise respond to the error signal may be undertaken within the cache unit, within the CPU and within the system.