USBRESET. When the Host Controller enters this state, most of the operational registers are ignored by the Host Controller and need not contain any meaningful values; however, the contents of the registers (except Root Hub registers) are preserved by the HC. The obvious exception is that the Host Controller uses the HcControl register which contains the HostControllerFunctionalState. While in this state, the Root Hub is being reset, which causes the Root Hub’s downstream ports to be reset and possibly powered off. This state must be maintained for the minimum time specified in the USB Specification for the assertion of reset on the USB. Only the following interrupts are possible while the Host Controller is in the USBRESET state: OwnershipChange.
Appears in 2 contracts
Sources: Adopter’s Agreement for Open Host Controller Interface Reciprocal Covenant, Adopter’s Agreement for Open Host Controller Interface Reciprocal Covenant