US Patent 10916276 Nonvolatile memory and memory system

According to one embodiment, a nonvolatile memory includes a memory cell array including a first storage region and a second storage region, an input/output circuit configured to communicate with a memory controller, and a control circuit. The control circuit is configured to, upon receiving a first command from the memory controller, execute a first training operation related to the input/output circuit, and upon receiving a second command from the memory controller, store a first result of the first training operation in the first storage region.