Semiconductor memory device
Abstract:
A semiconductor memory device with a redundant configuration according to the present invention includes a roll call circuit which turns an output signal of a sense amplifier compulsorily to a signal of a predetermined logical level when a portion constituting the redundant configuration is accessed, and turns an output signal of the output control circuit to that of the same predetermined logical level when a write instruction is given outside a normal level. Whether a spare memory cell is accessed can be checked in every output and the redundant configuration can operate with stability.
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