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:
May. 17, 1994
Filed:
Aug. 17, 1992
Kouji Inoue, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A field memory self-refreshing device self-refreshes a field memory with a refresh clock signal derived from a reference clock and a self-refresh clock signal not derived from the reference clock. The field memory self-refreshing device has a reference clock stop determination circuit, a self-refresh clock generator and a refresh clock switching circuit. The reference clock stop determination circuit detects that input from the reference clock has stopped and outputs a reference clock stop signal when input from the reference clock stops. The self-refresh clock generator generates the basis for the self-refresh clock signal used for self-refreshing of the field memory when the reference clock stops. When the refresh clock switching circuit receives the reference clock stop signal from the reference clock stop determination circuit, the refresh clock switching circuit switches from a selection of the refresh clock signal based on the reference clock to a selection of the self-refresh clock signal.