SD SWITCHBOX IN A CELLULAR HANDSET
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0 Petitions
Accused Products
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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Citations
22 Claims
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1. (canceled)
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2. (canceled)
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3. A method for booting a cellular base band modem from NAND flash memory, comprising:
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booting a cellular base band modem in a peripheral mode; reading a secondary boot code image from a NAND flash memory; loading the secondary boot code image to internal SRAM of the cellular base band modem; executing the secondary boot code, by the cellular base band modem; further loading a full code image from the NAND flash memory to the internal SRAM of the cellular base band modem; and accessing, by the cellular base band mode, the NAND flash memory via an SD port as a standard memory card. - View Dependent Claims (6, 7)
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4. A method for arbitrating between a host device and a cellular base band mode for use of a shared SD storage, comprising:
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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; 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 said accessing, removing the busy state from the SD host bus. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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5. (canceled)
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16. A method for arbitrating between a host device and a cellular base band mode for use of a shared SD storage, comprising:
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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; 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 said accessing, removing the busy state from the SD host bus. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification