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. 11, 1992
Filed:
Sep. 27, 1990
Frederick Kwok-Yin Leung, Cupertino, CA (US);
Richard D Henderson, Sunnyvale, CA (US);
National Semiconductor, Santa Clara, CA (US);
Abstract
A circuit for sampling a digital input signal utilizing an asynchronous strobe signal and a method for such synchronization are disclosed. The circuit includes an input storage element, such as a latch, which stores the input signal upon receipt of a strobe signal. There is a possibility that the input storage element will become temporarily metastable, with the output of the element being indeterminate, should the digital input signal change levels at substantially the time that the strobe signal is received. The subject synchronization circuit includes circuitry which senses when the input storage element is metastable and gating circuitry which produces a synchronized signal after receipt of the strobe signal, provided the input storage element is not metastable. The synchronized signal can then be used to clock the stored input signal.