Semiconductor memory, method of controlling the semiconductor memory, and memory system

摘要

A semiconductor memory comprising an address transition detection circuit for detecting a transition of an address and outputs an address detection signal; an address input circuit for inputting an input address based upon the address detection signal; a command judgment circuit for decoding a command signal input and outputting a command judgment signal; a redundancy circuit for making a redundancy judgment based upon a redundancy judgment signal indicating timing of a redundancy judgment, wherein the redundancy circuit includes a redundancy judgment speed-up circuit for controlling an output of the redundancy judgment signal based upon a predetermined command signal.