Patent ID: 7606947

Claim:
A removable electronic device for transferring data to or receiving data from a host device, the removable electronic device comprising: a detector configured to detect a mode of operation to distinguish among a multimedia card (MMC) compatible mode, a universal serial bus (USB) compatible mode, and a Mu mode, wherein the Mu mode supports transfer of data compatible with the MMC compatible mode between the removable electronic device and the host device via a first USB interface, wherein, during detection of the Mu mode, the detector is configured to receive a command signal from the host device and, in response to the command signal, provide a Mu response and implement a synchronization wait period; a wrapper configured to convert data for data transfer via the first USB interface in the Mu mode; a USB physical layer circuit configured to transfer data compatible with the USB compatible mode via a second USB interface; a USB compatible device controller configured to control data transfer in the USB compatible mode via the second USB interface and data transfer in the Mu mode via the first USB interface; and an MMC compatible device controller configured to control data transfer in the MMC compatible mode via an MMC compatible interface.