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. 22, 1994
Filed:
Jul. 30, 1992
Eugene Wang, Fremont, CA (US);
Amdahl Corportion, Sunnyvale, CA (US);
Abstract
An apparatus is provided for synchronously selecting different oscillators as the system clock source. The apparatus is comprised of two oscillator selectors. Each of the oscillator selectors has as its inputs the output of each of the oscillators and a three-bit command code which indicates which of the oscillators is to be selected by the oscillator selector and a single clock output. A different oscillator may be selected by each of the oscillator selectors at the same time. The output of the oscillator selectors are inputs to the clock controller. The clock controller also receives command signals for controlling the switching of the clock controller between the outputs of the two oscillator selectors. The output of the clock controller is the clock source for the system and a status signal indicating which oscillator selector is presently being used.