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:
Jul. 07, 1992
Filed:
Dec. 20, 1990
Philip A Murphy, King of Prussia, PA (US);
UNISYS Corporation, Plymouth Meeting, PA (US);
Abstract
A non-return-to-zero synchronizer is described which creates an output pulse signal that is synchronized to a system clock signal, from an asynchronous input strobe signal which can occur at any point in a given system clock cycle. The first circuit element within the synchronizer captures the input strobe and toggles the state of its data output terminal in response to successive pulses of the asynchronous input strobe signal. The remaining portion of the synchronizer responds to each change in the state of the first circuit element and to produce an output pulse having a duration of one clock cycle. An alternative embodiment is described which utilizes a sequential logic circuit to generate the desired output pulse. Because the synchronizer uses a state change to indicate the occurrence of a strobe, the problem of resetting the initial circuit element to a particular logic level is eliminated.