Chapter 18. HT Power Management
The Previous Chapter
The previous chapter described the features of the optional HyperTransport double-hosted chain topologies. Topics include the reasons behind sharing and non-sharing chains, PCI configuration space registers used to initialize the fabric for multiple hosts, and tunnel support for upstream and downstream packets moving in both directions.
This Chapter
HT provides a variety of mechanisms to support power management. These mechanisms include LDTSTOP#, LDTREQ#, STPCLK messages, and STOP_GRANT messages. While these mechanisms are optional for HT devices, the specification requires this support for x86-based platforms. Note also that functions other than power management may make use of these signals ...
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