Patent ID: 7633826
Filing Date: 2009-12-15
Classification: G11C

Abstract:
1. A nonvolatile semiconductor memory comprising: a fuse data storage for storing fuse data including replacement data for replacing a first area with a second area in a memory cell array; a fuse data read unit for reading out the fuse data from said fuse data storage; a read control circuit which, when activated, outputs a control signal for reading out the fuse data to said fuse data read unit; and an activation control circuit for activating or deactivating said read control circuit in accordance with external input, wherein if a predetermined command is input for the first time, said activation control circuit interprets that this command is a command for reading out the fuse data, and activates said read control circuit, and, if the predetermined command is input for the second time or thereafter, said activation control circuit interprets that this command is not a command for reading out the fuse data, and deactivates said read control circuit.