Apparatuses, systems, and methods are presented for a direct interface between a memory controller and a non-volatile memory controller using a command protocol. A method includes receiving a command from a memory controller to a non-volatile memory controller over a wire interface by way of a command protocol. The memory controller is coupled to one or more processors and the non-volatile memory controller, in one embodiment, is coupled to non-volatile memory media. The command protocol includes a control path that enables the memory controller to distinguish among different memory modules. A method includes executing the command within the non-volatile memory controller in response to determining that the non-volatile memory controller is capable of satisfying the command.