METHOD FOR CARING ADDRESS ACCESSED FREQUENTLY AND MEMORY SYSTEM WITH ADDRESS CARING FUNCTION

摘要

PURPOSE: A concentrated address caring method and a memory system with a concentrated address caring function are provided to guarantee the data retention reliability of memory cells adjacent to access-concentrated memory cells by reducing stress to be applied to the memory cells. CONSTITUTION: A semiconductor memory device (300) of a memory system includes a semiconductor memory cell array and a concentrated address processing part (301). A demultiplexer demultiplexes a concentrated row address according to a control signal. An adjacent row address extractor extracts adjacent row addresses from the concentrated row address outputted from the demultiplexer. A multiplexer selects an adjacent row address from the extracted adjacent row addresses according to a selection control signal and outputs the selected adjacent row address.