Memory system, operating method thereof, debugging device and debugging method

A memory system includes a memory device configured to store a plurality of data items; a scan chain configured to receive the plurality of data items and configured to generate scan output data of the plurality of data items; and a controller configured to replace the scan output data with the replaced data. The scan chain is also configured to receive alternate data from the controller. 一种存储器系统包括：存储器设备，被配置为存储多个数据项；扫描链，被配置为接收多个数据项并且被配置为生成多个数据项的扫描输出数据；以及控制器，被配置为用替换的数据替换扫描输出数据。扫描链还被配置为从控制器接收替换的数据。