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:
Jan. 10, 1989
Filed:
Nov. 16, 1987
Hilding E Nelson, Scandia, MN (US);
Jeffrey O Brown, St. Paul, MN (US);
Shayne M Zurn, Blaine, MN (US);
NCR Corporation, Dayton, OH (US);
Abstract
A method for evaluating the metastability characteristics of a synchronizing device having a latching stage, based upon theoretical and/or empirical evaluation of the latching stage circuit. The procedure first defines threshold requirements for an acceptable synchronizing device, including the requirement of a stable response for the latching stage in the region of the metastable operating point, and a further requirement of closed loop gain in excess of one in such operating region. Once the threshold condition are satisfied, mean time between failure to resolve can be conservatively estimated from values of effective gain, effective time delay, permissible time to resolve, rise time on the clock signal, frequency of the clock signal and frequency of the data signal.