SD switch box in a cellular handset

Details SD switch box in a cellular handset SD switch box in a cellular handset

2010-09-04

2011-11-29

Sorrell, Eron J (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S048000, C710S074000, C710S107000, C710S108000

Reexamination Certificate

active

08069282

ABSTRACT:
A method for arbitrating between a host device and a cellular base band mode for use of a shared SD storage, including requesting, by a cellular base band modem from a host device, access to an SD storage, including 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, including writing an access grant message, 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, 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 the accessing, removing the busy state from the SD host bus.

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