Patent ID: 6788599
Filing Date: 2004-09-07
Classification: G11C

Abstract:
An auto precharge apparatus having an auto precharge gapless function protecting circuit in a semiconductor memory device, the apparatus comprising:an internal cas command signal generating means for receiving a bank address and an external cas command signal, and generating an internal cas command signal; a burst length counter for receiving the internal cas command signal and a burst stop signal, and generating a burst end signal representative of an end of a burst operation; an auto precharge signal generating means for receiving the burst end signal, the internal cas command signal, an auto precharge end signal and an external address, and generating an auto precharge peri signal and an auto precharge core signal; and an internal row active signal generating means for receiving the auto precharge peri signal, the auto precharge core signal, and an externally-inputted row active signal, and generating a row active peri signal for enabling a word line and a row active core signal for disabling the word line, wherein the internal cas command signal generating means determines the generation of the internal cas command signal in response to the row active peri signal for enabling the word line.