A control unit for a memory module includes a usage determination unit configured to determine accumulated usage information and a control circuit coupled to the usage determination unit. The security module is controlled by a descriptor that includes instructions that cause the security module to access a generated random number, compare the generated random number to a random number stored during a previous execution of the descriptor, and generate an error signal when the generated random number and the previous execution random number are equal. A plurality of the packages can be simultaneously formed at wafer level or carrier level, to simplify the process and to be favorable for mass production.