SYNCHRONOUS SEMICONDUCTOR STORAGE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a synchronous semiconductor story device which can be prevented from entering into a test mode accidentally while it is in practical use. SOLUTION: A reset signal generating circuit 150 in a synchronous semiconductor memory device 1000 outputs a reset signal ZPOR1 in response to a power-on rest signal ZPOR which is generated immediately after a power supply is closed and an initialization command (for instance a precharge command) which is practiced for initialization after the power supply is closed. A test mode register included in a mode setting circuit 104 receives the reset signal ZPOR1 as a reset signal. With this constitution, an outputted test mode signal is put into an NOP state or the output of the test mode signal is discontinued.