Bi-directional data input/output circuit of a synchronous memory device and the method for controlling the same

摘要

There is disclosed a bidirectional data input/output circuit of a synchronous memory device and the method for controlling the same according to the present invention. The synchronous memory device according to the present invention is aimed at solving a data confusion problem generated when a write operation subsequent to a data read operation is performed in a data input/output line. Though the data line is a bidirectional bus data line by which an input/output is also performed, it can be applied to a circuit construction in which high and low potential data are inputted/outputted through an independent dedicated line. In addition, there is provided an internal buffer for inputting a write data into the memory device. The circuit according to the present invention further includes a memory for storing a data signal generated upon a read operation, when a read operation subsequent in time to a write operation is performed; and a device for selecting as a write data the opposite signal of the data signal generated upon a read operation when the two data lines both become active.