February 2003
Intermediate to advanced
592 pages
11h 47m
English
Content preview from HyperTransport™ System Architecture
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Reporting Power Management Events to HT Devices
In response to a STOP_GRANT message, the SMC controller may assert LDTSTOP to all HT device interfaces as illustrated in Figure 18-1 on page 438. For example, when the Host Bridge detects that the Processor is entering a VID/FID change, it will send a STOP_GRANT message indicating the change and causing the SMC to assert LDTSTOP#. Details regarding the timing relationships between the reception of STOP_GRANT and the assertion of LDTSTOP# is discussed in “The Link Initialization Disconnect Sequence” on page 227.
Figure 18-1. LDTSTOP# is an Input to All HT Devices Except the SMC.
As described earlier, ...
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