SEMICONDUCTOR MEMORY APPARATUS HAVING BLOCK-BASE REFRESH FUNCTION

摘要

PURPOSE: A semiconductor memory apparatus having a block-base refresh function is provided to reduce the power consumption upon performing a refresh operation by combining a control signal and a decoded row address signal to assign a memory block. CONSTITUTION: A semiconductor memory array(360) has a region that is divided into blocks. A refresh operation generator(310) receives control signals to generate a refresh signal and an entry signal. A mode resistor(370) receives the control signals and an external address to generate a starting signal. A refresh counter(330) counts a row address to be refreshed upon performing a refresh operation. A low address buffer(320) buffers the external address to output it or buffers the low address generated in the refresh counter(330) to output it. A low decoder(340) decodes the low address generated from the low address buffer(320). A block selector(350) combines the output signal of the low decoder(340), the refresh signal, the entry signal, and the starting signal to assign a memory block.