MEMORY MODULES AND MEMORY SYSTEMS

摘要

A memory module comprises a plurality of memory devices and a buffer chip. The buffer chip manages the operations of the plurality of memory devices. The buffer chip includes a memory management unit having an error correction unit to perform the error correction operation for each of the memory devices. Each of the memory devices includes at least one spare column which can be accessed from the memory management unit. The memory management unit corrects the errors of the plurality of memory devices by selectively using the spare column depending on the error correction capability of the error correction unit.