Patent ID: 7987308

Claim:
A memory card that is configurable as one of an SD card or an MMC card, the memory card comprising: a memory cell array; connection pins configured to interface with both an SD card input and an MMC card input, the SD card input of a first host that includes an SD interface and the MMC card input of a second host that includes an MMC interface; a special function register configured to receive a command in one of an SD protocol and an MMC protocol from one of the hosts across a pin of the connection pins and store the command therein; a detection circuit configured to read the command stored in the special function register, output a first mode enable signal when the command is an ACMD 41 command and the memory card is in an idle state, and output a second mode enable signal when the command is a CMD 1 command and the memory card is in the idle state; and a controller comprising an SD card logic circuit supporting the SD interface and an MMC card logic circuit supporting the MMC interface, wherein the controller enables the SD card logic circuit and disables the MMC card logic circuit in response to receipt of the first mode enable signal, and wherein the controller disables the SD card logic circuit and enables the MMC card logic circuit in response to receipt of the second mode enable signal.