Non-volatile semiconductor memory allowing user to enter various refresh commands

摘要

In a non-volatile flash memory having memory cells divided into blocks, a command state machine decodes a refresh command entered, and sends a decoded result to a write state machine. The write state machine performs a refresh operation in accordance with the decoded result. The nonvolatile flash memory allows a user to enter the refresh command. The refresh command includes "SINGLE BLOCK REFRESH", "FULL CHIP REFRESH", "REFRESH SUSPEND", and "REFRESH RESUME".