US Patent 7808837 Non-volatile memory control device

A memory controller outputs an additional writing instruction to one of a plurality of non-volatile memories arbitrarily selected via a writing instruction output unit when a signal which rejects a writing operation is not outputted from writing controllers of the plurality of non-volatile memories for a certain period of time, and outputs a temporary writing instruction to another non-volatile memory at least once via the writing instruction output unit by the time when the additional writing operation is completed in the arbitrary non-volatile memory.