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:
Sep. 02, 1997
Filed:
Jan. 22, 1996
Larry L Byers, Apple Valley, MN (US);
David J Tanglin, Anoka, MN (US);
Paul A LaBerge, Coon Rapids, MN (US);
Gregory B Wiedenman, Woodbury, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A power loss detection and recovery circuit for providing continued memory operations upon loss of a supply voltage. Multiple independent power domains, each of which provides an electrically isolated supply voltage, are used to provide power to redundant memory circuitry. A loss of voltage or a degenerative voltage within a power domain is detected, and circuitry residing on a different operational power domain provides recovery operations to allow continued memory activity within that operational power domain. The memories residing in an adjacent pair of power domains redundant, and are therefore written to and read from simultaneously, and circuitry within an operational power domain will prevent further reading of data from the memory residing in a failed power domain, and will also prevent further writing of data to the memory residing in the failed power domain upon recognition of a failed supply voltage within a power domain.