Common use of List Processing Clause in Contracts

List Processing. The Host Controller operates on the Endpoint Descriptors and Transfer Descriptors enqueued by the Host Controller Driver. For interrupt and isochronous transfers, the Host Controller begins at the Interrupt Endpoint Descriptor head pointer for the current frame. The list is traversed sequentially until one packet transfer from the first Transfer Descriptor of all interrupt and isochronous Endpoint Descriptors scheduled in the current frame is attempted. For bulk and control transfers, the Host Controller begins in the respective list where it last left off. When the Host Controller reaches the end of a list, it loads the value from the head pointer and continues processing. The Host Controller processes n control transfers to 1 bulk transfer where the value of n is set by the Host Controller Driver. When a Transfer Descriptor completes, either successfully or due to an error condition, the Host Controller moves it to the Done Queue. Enqueuing on the Done Queue occurs by placing the most recently completed Transfer Descriptor at the head of the queue. The Done Queue is transferred periodically from the Host Controller to the Host Controller Driver via the HCCA.