Chapter 7. Transaction Examples
The Previous Chapter
The previous chapter described the ordering rules which apply to packets associated with the three types of HyperTransport I/O traffic: PIO, DMA, and Peer-to-Peer. Depending on whether compatibility with the full producer-consumer ordering model used in PCI is required or relaxed ordering is permissible, attribute bits in request and response packets may be set or cleared. These bits are defined by the requester and are used by devices in the path to the target, and within the target, to enforce proper ordering. HyperTransport applies dedicated sets of ordering rules for upstream I/O traffic, downstream I/O traffic, and the special ordering required of host bridges and in double-hosted chains. ...
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