Synchronous semiconductor memory device which allows switching of bit configuration

摘要

A synchronous DRAM includes a selector which supplies 2 bits of serial data signals from one data input/output terminal to two input/output line pairs as parallel data signals in x8 configuration mode, and supplies 2 bits of parallel data signals from both data input/output terminals directly to two input/output line pairs in x16 configuration mode. Therefore, the synchronous DRAM allows switching of bit configuration, and it takes 2-bits prefetch configuration in x8 configuration mode, and signal pipeline configuration in x16 configuration mode.