SEMICONDUCTOR MEMORY DEVICE

摘要

PURPOSE: A semiconductor memory device is provided to make the reading and writing speed of flash data of an SDRAM and SRAM same by copying flash data to a DRAM. CONSTITUTION: In a semiconductor memory device, a controller is combined in an SDRAM and an NAND type flash memory. An external terminal is combined in the controller. The access to the NAND type flash memory is passed via the SDRAM. The SDRAM has a first area.