Patent ID: 7764560
Filing Date: 2010-07-27
Classification: G11C

Abstract:
1. A method for refreshing at least one of a plurality of memory cell blocks of a semiconductor memory device in refresh mode, wherein the semiconductor memory device includes a plurality of word line drive circuits and a plurality of power supply control circuits, each of the plurality of word line drive circuits driving a word line of the corresponding memory cell block, each of the plurality of power supply control circuits supplying the corresponding word line drive circuit with a power supply for driving the word line, the method comprising: selecting one of the plurality of memory cell blocks in the refresh mode; activating one or more word line drive circuits associated with one or more memory cell blocks that have not been selected; deactivating one or more power supply control circuits associated with one or more memory cell blocks that have not been selected, and controlling one or more word lines, which are associated with the one or more memory cell blocks that have not been selected, to have a floating potential.