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:
Nov. 19, 1991
Filed:
Sep. 05, 1989
Richard C Pedersen, -Burnsville, MN (US);
Richard M Sedro, Roseville, MN (US);
Control Data Corporation, Minneapolis, MN (US);
Abstract
A radiation hardened or fail safe circuit is coupled between a peripheral data storage device, for example a disk drive, and its associated controller. The circuit includes an AND logic gate with two inputs: a write enable signal from the controller; and a sensing input logic signal normally high, but driven low responsive to the sensing of unacceptably high levels of radiation. A delay means is interposed between the controller and the AND gate, for delaying propagation of the write enable signal a sufficient amount of time to ensure that the sensing input to the AND gate responds to the detection of high radiation before the arrival of the write enable signal. The delay means can be an LC delay circuit, a coaxial cable, or a series of latches clocked in alternation order by opposite phases of an oscillator.