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, 2000
Filed:
Dec. 16, 1997
Naomi Yamazaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
When normal data is written to a desired address in a DRAM, a guarantee bit comparing/generating circuit sets the value of guarantee bit data stored at the address corresponding to the desired address in a DRAM as a value indicating that the normal data has been written. Since the guarantee bit data stored at each address in the DRAM always becomes '000' or '111' immediately after power is turned on, the above described value indicating that the normal data has been written is set as a value other than '000' and '111'. Thereafter, if the value of the guarantee bit data stored at the address corresponding to the desired address in the DRAM indicates that the normal data has been written when the normal data is read from the desired address in the DRAM, the normal data read from the DRAM is output to a data bus. Otherwise, the fixed value '0' is output to the data bus as read data.