MEMORY, IN WHICH DISTURB PHENOMENON IS SUPPRESSED

摘要

PURPOSE: A memory is provided to suppress disturb phenomenon during a read operation by suppressing polarization degradation during the read operation. CONSTITUTION: A read-rewrite operation is performed during the periods of T1, T2 and T3. The periods of T2 and T3 are determined so that polarization variation in a memory cell becomes equal when an electric field of opposite direction each other in each period of T2 and T3 are supplied to the memory cell. t1 is a period of making all bit lines be in a floating state. The start timing of t1 is equal to or faster by several nsec - several tens of nsec than the timing of applying Vcc to a selection word line(WL).