Data control method and data controller

TL;DR: In this paper, a data control method and data controller for preventing the generation of the area where effective data is not written is proposed, which is performed as follows: data is written to the minimum writing unit being xth from the top in a flash memory 22 where the minimum data size is n bits, and the effective data length of the data written to m bits.

Abstract: PROBLEM TO BE SOLVED: To provide a data control method and data controller for preventing the generation of the area where effective data is not written. SOLUTION: The data control method is performed as follows. Data is written to the minimum writing unit being xth from the top in a flash memory 22 where the minimum writing unit is n bits, and the effective data length of the data written to the xth minimum writing unit is m bits. In this case, when new data of l bit is written, the new data is divided into (n-m)-bit data, y pieces of n-bit data, and j-bit data (j=l-((n-m)+(n×y))). First data, where (n-m)-bit data are aligned after the alignment of values "1" for m bits, and second data, where the values "1" are aligned for n-j bits after the j-bit data, are generated. The first data, y pieces of n-bit data, and the second data are respectively written to the xth, x+1th to x+yth, and x+y+1th minimum writing units. COPYRIGHT: (C)2011,JPO&INPIT