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. 31, 1995
Filed:
Feb. 08, 1993
Edward C Hallee, Wappingers Falls, NY (US);
Suo-Lun Huang, Wappingers Falls, NY (US);
Kirk H Hwang, Poughkeepsie, NY (US);
Benedicto U Messina, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Logic fencing circuit and method are provided for increasing system protection at a multiprocessor system interface so that spurious noise (e.g., attributable to an electrostatic discharge through a signal cable) is more reliably isolated from an active portion of the processing system. The noise fencing circuit, which is responsive to a fence control signal, includes logic circuitry for attenuating a received noise signal by constraining the noise signal to a magnitude less than or equal to the voltage level of a system power supply. The attenuating circuitry outputs an attenuated noise signal to a signal fence circuit which, when enabled by the fence control signal, outputs a substantially constant isolation signal in response to a received, attenuated noise signal. A logically staged fencing method is also set forth.