| 摘要 |
PURPOSE:To relieve an input-output circuit at the time of multiple bits input- output by adding redundancy to the input-output circuit as well as a memory cell. CONSTITUTION:The data input and data output signal of a memory system outer part is commonly owned by spaces between memory blocks 15-15 which are adjoin each other. Namely, the number of data input-output and one memory block for the redundancy are prepared and control signals S0-S4 are formed based on defective memory block data which are stored in a fuse and the like. They are supplied to selector circuits 14-14 and 14-14 which are prepared in the memory block data input-output part and one piece of arbitrary memory block is relieved. In this case, selector circuits 14-14 constitute a first selection means and selector circuits 13-13 constitute a second selection means. Thus, the input-output circuit at the time of multiple bit input-output can be relieved. |
