Memory card and method for rewriting data

一种存储卡，其控制器3具有用于对由主机HT发送的命令进行解码的一个命令解码电路6、其中设置了所接收命令的有效性或无效性的一个命令使能寄存器8以及一个命令检测信号产生电路7。其中，所述命令检测信号产生装置，用于根据命令解码电路6解码的结果以及由命令使能寄存器8设置的值来检测一个有效命令。如果所述命令使能寄存器8接收了一个有效设置命令，则命令检测信号产生电路7将向控制单元4提供一个检测信号，以便执行为每条命令所指定的处理。所述命令使能寄存器8接收一个无效设置命令，则不提供检测信号，并忽略该命令。 A controller 3 of a memory card is a provided with a command decoding circuit 6 for decoding commands issued by a host HT, a command enable register 8 in which the validity or invalidity of the received command, and a command detection signal generating circuit 7 for detecting a valid command on the basis of the result of decoding by the command decoding circuit 6 and a value set by the command enable register 8. If the command enable register 8 receives a validly set command, the command detection signal generating circuit 7 will supply a detection signal to a control unit 4 to execute processing prescribed for each command. the command enable register 8 receives an invalidly set command, no detection signal will be supplied, and the command will be ignored.