Memory device, method of operating the memory device, memory module, and method of operating the memory module

A method of operating a nonvolatile dual in-line memory module (NVDIMM), the NVDIMM including a multiport dynamic random access memory (DRAM), and a nonvolatile memory (NVM) device including an NVM and an NVM controller, the method comprising:

• receiving an externally supplied first command;
• reading data from the NVM and storing the data in the NVM controller in response to the first command;
• transmitting a ready signal externally of the NVDIMM;
• receiving an externally supplied second command;
• transmitting an internal read command to the NVM controller in response to the second command;
• transmitting an internal write command to the DRAM a period of time after transmitting the internal read command to the NVM controller;
• and
• transferring the data from the NVM controller to the DRAM in response to the internal read and write commands.