Each device controller is in charge of a particular device type. 每一設備控制器負責一個設備類型。
In general, the device controller will request bus mastership and once this has been obtained will transfer one or more data items. 一般來說，設備控制器將請求公共汽車精通和，一旦這獲得了轉移一個或更多數據項。
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