System Management Transactions
HT provides a message passing mechanism between the Host Bridge and the System Management Controller (SMC). One of the primary purposes of HT messages is to eliminate dedicated pins and traces that would otherwise be required to signal various events, reducing pin count and cost. These System Management (SM) messages are delivered via packets that support a wide variety of functions including:
HT Power Management
X86 Power Management
X86 Legacy CPU Signalling (e.g. A20M, FERR#, and IGNNE#)
HT System Management messages in conjunction with LDTSTOP# may be used to support operations such as changes in operating frequency and link width, or to disable the links to save power. It is also through System Management (SM) ...
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