Using a control line to insert a control message during a data transfer on a bus

摘要

Asynchronous and isochronous data is transferred over a bus connecting a first device and a second device. Data is selectably transferred over the bus in either asynchronous priority mode or isochronous priority mode. Asynchronous priority mode gives priority to transfer of the asynchronous data and isochronous priority mode gives priority to transfer of the isochronous data. In addition, data transferred over the bus is selectably transferred in either whole-bus mode: in which the entire data bus transfers data in one direction or in or half-bus mode in which portions of the data bus may transfer data in different directions.