Multiple communication channels on MMC or SD CMD line
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United States of America Patent
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Feb 26, 2013
Grant Date -
Sep 6, 2012
app pub date -
Mar 2, 2012
filing date -
Sep 1, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The claimed subject matter can provide an architecture that interfaces a single slave device such as a UICC smartcard with multiple host controllers. For example, a secondary host can be interfaced between a primary host (e.g., a controller in a cellular phone, a PDA, an MP3 player . . . ) to manage all transactions with the slave device. The secondary host can operate transparently to the primary host and thus does not require any modifications to the primary host. This can be accomplished, e.g., by employing the CMD channel (which is relatively sparsely used by the primary host) to communicate both commands and data with the slave.
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