February 2003
Intermediate to advanced
592 pages
11h 47m
English
Content preview from HyperTransport™ System Architecture
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Signaling Wakeup
Most power management schemes provide a mechanism that allows a device to initiate a sequence that returns the system from a power conservation state to a fully operational state. HT provides this ability via the LDTREQ# signal. Figure 18-2 shows that the LDTREQ# signal is an output from each HT device interface and an input to the SMC.
Figure 18-2. LDTREQ# is an Output from All HT Devices and an Input to the SMC.
An HT device currently in a low-power state (LDTSTOP# asserted) may assert LDTREQ# to initiate a system wakeup. The actions taken by the SMC to transition the system back to normal operation includes:
deasserting LDTSTOP# ...
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