SEMICONDUCTOR MEMORY DEVICE, CAPABLE OF PROPERLY SELECTING A FAST EXIT MODE AND A SLOW EXIT MODE, A MEMORY CONTROL PART THEREOF, AND AN INFORMATION PROCESSING SYSTEM THEREOF

摘要

PURPOSE: A semiconductor memory device, a memory control part thereof, and an information processing system thereof are provided to reduce power consumption by using a selection signal which is inputted to a semiconductor memory device when a power-down command is generated.;CONSTITUTION: A memory cell array(70) comprises a plurality of memory cells. An output buffer(81) outputs read data, which is read from the memory cell array, to the outside. A DLL(Delay Locked Loop) circuit(23) controls the operation timing of the output buffer. A power-down control circuit(100) stops the operation of a predetermined internal circuit in response to the generation of a power-down command from the outside. A clock generating circuit(22) generates an internal clock.;COPYRIGHT KIPO 2011