Memory systems having improved out-of-order execution of commands and methods for operating the same

A memory controller is disclosed. The memory device controller, estimates a time period required to complete a set of execution of the atomic instruction assigned to the channel, the need to for each of a plurality of the atomic instruction is completed a set of execution of the atomic instruction is assigned to the channel and after the period has expired, and calculate the emergency value associated with the completion of the execution of the memory command, based on the calculated emergency values ​​for execution by the non-volatile memory for each of the plurality of atomic instruction in the said set of atomic commands schedule, and for execution by the scheduled sequence comprises a sequencer for outputting a non-volatile memory, said plurality of atomic commands.