Patent ID: 6888764
Filing Date: 2005-05-03
Classification: G11C

Abstract:
1. A semiconductor device comprising: an address counter to output, in a first mode, a first block address selected from a first block-address space corresponding to a plurality of memory blocks, the memory blocks and at least one redundant block being included in a memory section, whereas, in a second mode, a second block address selected from a second block-address space two times larger than the first block-address space; a memory to store addresses of the memory blocks and an address of the redundant block with which any one of the memory blocks is to be replaced when defective; a memory-to-redundant block replacement decider to output an agreement signal when an output of the address counter and an address of the redundant block stored in the memory are equal to each other; and a block-selection controller to select, in the second mode, one of the memory blocks, which corresponds to the output of the address counter, when a most significant value of the second block address as the output of the address counter is at a first level whereas select the redundant block while the memory blocks are inhibited from selection, when the most significant value is at a second level, and in the first mode, select one of the memory blocks, which corresponds to the output of the address counter, when the agreement signal is not output from the memory-to-redundant block replacement decider whereas select the redundant block with which one of the memory blocks, which corresponds to the output of the address counter, is to be replaced based on the output of the memory, while the memory blocks are inhibited from selection, when the agreement signal is output from the memory-to-redundant block replacement decider.