HyperTransport Protocol Concepts
Channels and Streams
In HyperTransport, as in other protocols, ordering rules are needed for read, posted/non-posted write transactions, and responses returning from earlier requests. In a point-point fabric, all of these occur over the same link. In addition, transactions from different devices are also merging over the same links. HyperTransport implements Virtual Channels and I/O Streams to differentiate a device's posted requests, non-posted requests, and responses from each other and from those originating from different sources.
Virtual Channels
HyperTransport defines a set of three required virtual channels that dictate transaction management and ordering:
Posted Requests — Posted write transactions belong ...
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