SEMICONDUCTOR MEMORY AND METHOD FOR CONTROLLING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor memory having a transfer system for transferring data synchronized with both edges of the leading and trailing of an outside clock signal, and yet easily being tested and evaluated by a conventional memory testing device with respect to SDRM for writing/reading data synchronously with the outside clock signal and a method for controlling the SDRAM and to provide a control method for the semiconductor memory. SOLUTION: This semiconductor memory is provided with a write amplifier controlling part 14 and an I/O data buffer/register 22 corresponding to the both data transfer systems of a DDR(double data rate) system and an SDR system as data transferring means. Also, a mode register 28 is used as a switching signal generating means for switching the data transferring means to either the DDR system or the SDR system.