HAGIWARA SYS-COM CO., LTD.
|HAGIWARA SYS-COM CO., LTD. Patent applications|
|Patent application number||Title||Published|
|20090172267||REFRESH METHOD OF A FLASH MEMORY - A flash memory device includes a flash memory that stores many physical data blocks, a refresh management table that stores indications of the number of times each individual physical data block has been read, and a controller responsive to read and erase control signals from a source external to the flash memory device, and to the stored indications of the refresh management table for controlling reading, erasing and refreshing of the individual physical data blocks. In response to the number of times each individual physical data block has been read being equal to or exceeding a limit value, the controller refreshes the individual physical data block associated with the indication equaling or exceeding the limit value.||07-02-2009|
|20090113119||DATA WRITING METHOD - Data are write commanded from a host into a NAND flash memory. The data are saved once in a cache memory before being written into the NAND flash memory. The cache memory includes a physical segment whose size is the product of one page sector size of the NAND flash memory and the m-th power of 2 (m is 0 or a positive integer). A CPU records and manages the data writing status for each physical segment in a sector unit.||04-30-2009|
Patent applications by HAGIWARA SYS-COM CO., LTD.