Host Bridge Behavior
Host bridges always reside at the ends of HyperTransport chains. They never forward packets, but will have occasion to accept and reject packets. There is additional complexity caused by the responsibilities host bridges may have in supporting double-hosted chains (this is optional) and peer-to-peer transfers (required). The following sections describe host bridge behavior in accepting and rejecting packets they receive.
Directed Request With UnitID = 0
Directed requests with a UnitID = 0 detected by the HyperTransport interface of a host bridge are inbound from the host at the other end of a double-hosted chain.
Accepted
If the host bridge recipient of the request has implemented internal memory or I/O space and owns the ...
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