SEMICONDUCTOR MEMORY DEVICE AND SYSTEM HAVING REDUNDANCY AREA

摘要

PURPOSE: A semiconductor memory device including a redundancy area and a system are provided to efficiently use a redundancy memory by performing a repair operation with a bit unit or a group unit. CONSTITUTION: A memory cell array(110) includes a plurality of memory cell groups(111-114) and a redundancy memory cell group(115). The memory cell groups include a plurality of memory cells. The redundancy cell group includes a redundancy memory cell to repair a defective cell included in the memory cell groups. A part of the memory cells arranged in the same row or column is replaced by the redundancy memory cell. Data is transmitted through a data line connected to the replaced redundancy memory cell.