Common use of Communication Channels Clause in Contracts

Communication Channels. There are two communication channels between the Host Controller and the Host Controller Driver. The first channel uses a set of operational registers located on the HC. The Host Controller is the target for all communication on this channel. The operational registers contain control, status, and list pointer registers. Within the operational register set is a pointer to a location in shared memory named the Host Controller Communications Area (HCCA). The HCCA is the second communication channel. The Host Controller is the master for all communication on this channel. The HCCA contains the head pointers to the interrupt Endpoint Descriptor lists, the head pointer to the done queue, and status information associated with start- of-frame processing. Device Enumeration OpenHCI Operational Registers Mode HCCA Status Event Frame Int Ratio Control Bulk Host Controller Commications Area Interrupt 0 Interrupt 1 Interrupt 2 Interrupt 31

Communication Channels. There are two communication channels between the Host Controller and the Host Controller Driver. The first channel uses a set of operational registers located on the HC. The Host Controller is the target for all communication on this channel. The operational registers contain control, status, and list pointer registers. Within the operational register set is a pointer to a location in shared memory named the Host Controller Communications Area (HCCA). The HCCA is the second communication channel. The Host Controller is the master for all communication on this channel. The HCCA contains the head pointers to the interrupt Endpoint Descriptor lists, the head pointer to the done queue, and status information associated with start- start-of-frame processing. Device Enumeration OpenHCI Operational Registers Mode HCCA Status Event Frame Int Ratio Control Bulk Host Controller Commications Area Interrupt 0 Interrupt 1 Interrupt 2 Interrupt 31