Sharing a Common Resource Via Multiple Interfaces
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United States of America Patent
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Issued Date -
Jun 23, 2016
app pub date -
Dec 19, 2014
filing date -
Dec 19, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In one embodiment, an electronic system includes a shared resource and multiple controllers connected to the shared resource by different resource interfaces. In order to coordinate control of the shared resource, which can be controlled by only one controller at a time, the system has an arbitration device that communicates with the multiple controllers over one or more arbitration interfaces (different from the resource interfaces). The arbitration device has a register that stores (i) a controller identification value that identifies one of the controllers and (ii) a control status value that indicates whether the identified controller currently controls the shared resource. Each controller reads data stored in the register to determine whether the shared resource is currently controlled by a controller, and each controller writes data to the first register to secure control of the shared resource, when the shared resource is not currently controlled by a controller.
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