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:
Oct. 13, 1981
Filed:
Mar. 31, 1980
Don R Draper, Lisle, IL (US);
Peter Kusulas, Jr, Glen Ellyn, IL (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A circuit for the detection of write errors in a memory with selectable byte addressing. The memory is capable of selectively writing bytes within a memory word by decoding control signals and address signals received from a processor. The decoder and transmission path of the control signals are checked by the processor generating incorrect parity for the bytes which are not to be written. The memory decodes the control signals, checks the parity of the bytes, and generates a write parity error if the decoder selects a byte with incorrect parity to be written. If the memory malfunctions and spuriously writes an unselected byte, this fact will be detected when the unselected byte is read. The memory checks each byte read for parity, and incorrect parity causes the memory to transmit a read memory error to the processor.