Semiconductor device to select and output data to a data bus

Abstract

A semiconductor device that can transmit data in wide bus width regardless of the width of an external data bus connected thereto. In a semiconductor device on the data output side, m-bit internal data is divided into n blocks. A data selection circuit selects m/n pieces of data at a time and a data output section outputs these pieces of data to an external data bus of a width of L(=m/n) bits. At this time an output control circuit controls the selection of data by the data selection circuit and a synchronous signal output section outputs a synchronous signal indicative of selected data. In a semiconductor device on the data input side, a data input section accepts data transferred via an external data bus and a data get circuit outputs the data to an internal data bus corresponding to a synchronous signal a synchronous signal input section accepted. By getting data corresponding to all synchronous signals, the data get circuit will get m-bit data.