NON-VOLATILE SEMICONDUCTOR MEMORY CONTROLLER FOR PROCESSING ONE REQUEST FIRST BEFORE COMPLETING ANOTHER REQUEST, MEMORY SYSTEM HAVING THE SAME AND METHOD THERE-OF

摘要

PURPOSE: A non-volatile semiconductor memory controller for processing one request first before completing another request, a memory system having the same and a method thereof are provided to accelerate reading and writing speed of a flash memory while reducing response time for a host by processing another request before completing the in-process operation in a flash memory system. CONSTITUTION: A flash memory(200) stores user data and meta data. A first memory(120) loads the meta data. A second memory(130) stores and duplicates the meta data. A flash memory controller(150) duplicates the meta data saved in the first memory to the second memory in case of a first type operation requiring the change of meta data. The flash memory controller stores the changed meta data as described above in the first memory.