Patent ID: 9299455
Filing Date: 2016-03-29
CPC Classification: G06F,G11C

Claim Text:
1. A semiconductor storage device, comprising: a nonvolatile semiconductor memory comprising a plurality of storage areas; and a controller, which is coupled to the nonvolatile semiconductor memory, wherein the controller is configured to manage storage area state information on a basis of each storage area, including at least one of information related to elapsed time after data is written to the storage area and information related to cumulative erase number of the storage area; wherein the controller is configured to manage read parameter information including one or more read parameters relevant to at least one of elapsed time after data programming to the storage areas and cumulative erase number of the storage areas; wherein the controller is configured to specify a first read parameter corresponding to a first storage area of the plurality of storage areas, based on the storage area state information corresponding to the first storage area and the read parameter information; wherein the controller is configured to read data from the first storage area by using the first read parameter; wherein the storage area state information is configured to further include information related to an ambient temperature of each of the storage areas; wherein the read parameter information is configured to manage the one or more read parameters for the storage areas at a standard temperature; and wherein the controller is configured to convert the elapsed time after the data is written to the storage area at the ambient temperature into an adjusted elapsed time at the standard temperature, and wherein the controller is configured to specify the first read parameter by using the adjusted elapsed time.