Memory card and initialization setting method thereof

Abstract

Whether an initial command outputted from a host is ‘CMD1’ or ‘CMD55+CMD41’ is detected with an initial command detection portion 8 , and the result of detection is set in an SD/MMC register 13 . Reset process for hardware and that for firmware are carried out based on the result of detection set in the SD/MMC register 13 . Thereafter, a microcomputer 7 sets data indicating in which mode, MultiMedia Card mode or SD mode, the firmware reset process was carried out, in a F/W process SD/MMC register 14 . A H/W-F/W mode comparison circuit 15 compares data in the SD/MMC register 13 with data in the F/W process SD/MMC register 14 . If these data agree with each other, busy state is released, and command wait state is established. If they disagree with each other, a disagreement occurrence detection signal is outputted to the microcomputer 7 , and power-on reset processing is performed again.

1 . A memory card comprising:
 a nonvolatile semiconductor memory having a plurality of nonvolatile memory cells and capable of storing predetermined information; and   a controller that instructs the operation of the nonvolatile semiconductor memory based on a command issued from the outside,   wherein the controller comprises a host interface portion that detects an initialization setting command for first or second operation mode issued from the outside, and, if, after completion of initialization setting according to the initialization setting command, the operation mode of the detected initialization setting command and the operation mode in which firmware reset process was carried out do not agree with each other, outputs a disagreement detection signal, and   wherein, when the controller receives a disagreement occurrence detection signal from the comparison circuit after execution of initialization setting, the controller carries out initialization process again based on the result of detection stored in an initialization command storage portion.   
   
   
       2 - 10 . (canceled)