REFRESH CIRCUIT OF A SEMICONDUCTOR MEMORY DEVICE FOR IMPROVING THE USAGE EFFICIENCY OF A MEMORY CELL ARRAY AND A REFRESH CONTROL METHOD

摘要

PURPOSE: A refresh circuit of a semiconductor memory device and a refresh control method are provided to improve an operation speed by making the other memory banks perform a normal operation when a part of the memory banks performs a refreshing operation.;CONSTITUTION: A bank selecting circuit (120) generates a selection signal based on a mode register signal having information of a memory bank which performs a refresh operation. A refresh controller (116) generates a self-refresh active command and a self-refresh address based on a self-refresh command and an oscillation signal. A multiplexer circuit (130) selects one of an active command and the self-refresh active command and generates a low active signal based on the selected command.;COPYRIGHT KIPO 2013