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. 11, 2004
Filed:
Jun. 08, 2001
Other;
Abstract
There is provided an error rate select circuit activated in an information sustaining mode, wherein data is read out from a memory circuit comprising dynamic memory cells and inspection bits for detection and correction of an error. If no error is detected, a first detection signal is accumulated in a first direction, that is, the first detection signal is added to a sum. If an error is detected, a second detection signal is accumulated in a second direction, that is, the second direction signal is multiplied by a weight to produce a product before subtracting the product from the sum. If the sum increases in the first direction, exceeding a predetermined value, the refresh period is lengthened by a predetermined incremental time. If the sum decreases in the second direction, becoming smaller than another predetermined value, the refresh period is shortened by a predetermined decremental time.