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:
Feb. 16, 1988
Filed:
Oct. 16, 1985
Katherine A Splett, Burnsville, MN (US);
Steven H Karban, Apple Valley, MN (US);
Gerald L Brown, Savage, MN (US);
Sperry Corporation, Blue Bell, PA (US);
Abstract
A timing generator and verifier is provided in which a PROM stores the timing constants that are employed by the generator. An address counter, which is driven by a clock timer, cycles through an associated portion of the PROM to provide a sequence of output signals which represent timing for a particular mode. If a different mode is selected, the address counter selects a different sequence of output bits. During Normal mode the address counter operates on a cyclic basis driven by a fixed frequency free running master clock. In Verify mode the address counter is stepped by the Host computer. The outputs of the PROM are coupled through a buffer and logic section, where the outputs may be modified before being coupled to an adder which accumulates a checksum based on the outputs of all of the bits for a particular selected timing. The checksum provided by the adder is compared in a comparator with a stored checksum that indicates whether the correct operation of the complex timing cycle for the selected mode has been verified.