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:
Mar. 10, 1992
Filed:
Sep. 21, 1990
Haruki Toda, Yokohama, JP;
Mitsugi Ogura, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A novel semiconductor memory device having address comparator, word line drive circuit sense circuit, and control circuit is disclosed. The comparator judges whether or not a row address read in the present access cycle is in correspondence with that in the last cycle. Where it is judged that the former is not in correspondence with the latter, the control circuit allows the sense circuit to select a word line by this row address to transfer data of a memory cell to the bit line to allow the sense means to sense. On the other hand, where it is judged by the comparator that the former is in correspondence with the latter, since data of the memory cell belonging to the same word line is already sensed in the last cycle, the control circuit allows the readout circuit to read out data from a bit line corresponding to the column address without causing the sense circuit to carry out a sense operation for a second time. Thus, only when the row address changes with respect to that in the last cycle, a sense operation is caused to be carried out. Thus, the readout operation can be performed at a high speed.