SEMICONDUCTOR STORAGE DEVICE AND CONTROL METHOD THEREOF

摘要

An objective of the present invention is to improve characteristics such as write speed, using a plurality of types of memory with different characteristics. A semiconductor storage device according to the present invention comprises: a first memory (102) whereto data is written in first write units; a second memory (104) whereto data is written in second write units which are greater than the first write units; and a control unit (106) which controls the writing of the data to the first memory (102) and the second memory (104). The control unit (106) sorts, in the first memory (102), frozen data which is data not accessed for overwriting in a prescribed interval, and writes the frozen data in the second write units to the second memory (104).