Patent ID: 8069282

Claim:
A method for arbitrating between a host device and a cellular base band modem for use of a shared SD storage, comprising: requesting, by a cellular base band modem from a host device, access to an SD storage, comprising writing an access request message; notifying the host device of the access request message; reading, by the host device, the access request message; granting, by the host device, the access request, comprising writing an access grant message as the first block of a multi-block write; notifying the cellular base band modem of the access grant message; reading, by the cellular base band mode, the access grant message; holding an SD host bus in a busy state, comprising preventing the host device from writing subsequent blocks of the mufti-block write, thereby forcing the host device to hold and not access the bus; accessing, by the cellular base band modem, the SD storage; and upon completion of said accessing, removing the busy state from the SD host bus.