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:
Aug. 21, 1990
Filed:
Jun. 01, 1987
Ferruccio Zulian, Cornaredo, IT;
BULL HN Information Systems Italia S.p.A., Milan, IT;
Abstract
Timing unit for generating a timing signal for synchronous microprocessors in which an oscillator generates a base frequency equal to four times the timing frequency for the microprocessor. A frequency divider divides the base frequency by four, and a shift register clocked by the base frequency and receiving a timing signal from the frequency divider, generates a mask signal. The mask signal is selectively applied to a control input of the frequency divider in response to one or more control signals, to inhibit the switching of the frequency divider. This thereby introduces in the phases of the timing frequency, wait states equal to 1/4 (or multiple thereof) of the timing frequency, thereby matching the microprocessor speed to the memory read/write cycle time.