Memory modules with error detection and correction

A memory module having error detection and correction mechanisms. The memory module includes a plurality of memory devices arranged in an array and a buffer device connected to the memory devices. The buffer device includes a register module for synchronizing and buffering a plurality of input signals to the memory devices, an error detection module for detecting errors of the input signals, and a transmission memory for storing a copy of the input signals and transmitting the stored copy of the input signals as an output signal. A buffer device for a memory module. A method of operating a memory module. A memory including a plurality of registers arranged in a pipeline for storing a plurality of copies of the input signals and communicating the stored copies of the input signals as an output signal to an external device.