| 摘要 |
A computer system includes a portable computing unit releasably coupled to a docking unit to which a target device is also coupled. The portable computing unit includes a detector that detects whether the portable computing unit currently is coupled to the docking unit and, if not, transmits an undocked signal indicating that the portable computing unit is not coupled to the docking unit. The portable computing unit also includes a processor that is structured to issue a request for access to the target device and a bridge that is structured to store an indication of whether the target device is coupled to the docking unit. The bridge uses the stored indication and the undocked signal to determine whether the target device currently is coupled to the bridge and, if the target device is not currently coupled to the bridge, terminates the transaction request and transmits to the processor an error signal indicating that the target device is not currently coupled to the bridge.
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