REFRESH APPARATUS FOR SEMICONDUCTOR MEMORY DEVICE AND REFRESH METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a refresh apparatus for a semiconductor memory device in which normal cell and a redundant cell can be a simultaneously refreshed and a test time can be shortened, and a refresh method. SOLUTION: This apparatus is provided with a redundant cell refresh signal generator 150 for generating a redundant cell refresh signal PTX-REF in response to a test mode signal TM and a refresh request signal RFH, a word line enable signal generator 160 for generating a normal main word line enable signal XDEN and a redundant main word line enable signal RXDEN in response to this output and a redundant cell test mode signal TM-XRED, and a word line driver 210 for simultaneously controlling word lines of both cells in response to this output, the redundant cell test mode signal TM-XRED, the redundant cell refresh signal PTX-REF, and a plurality of row address signals BXA<3:6>. COPYRIGHT: (C)2004,JPO