Bulk and Control Clause Samples

Bulk and Control. The Host Controller has a list head for both bulk and control transfers. Each Endpoint Descriptor list is a separate list, but its maintenance semantics are the same for Host Controller Driver. The ED_CONTROL and ED_BULK entries of the EdList array are assumed to be initialized at Host Controller Driver initialization time such that the list Head field is initialized to a null list and the PhysicalHead field contains the address of the proper list head operational register.