XIO3130
SLLS693F–MAY 2007–REVISED JANUARY 2010
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PRSNTn#
PWRONn#
CLKREQn#
REFCLKn
PERSTn#
PWRGDn
Stable
<500 ns
<100 ms
Figure 5-5. Surprise Removal
In the case of surprise removal, the XIO3130 switch de-asserts PERST within 500 ns after a de-bounced
PRSNTn de-asserted state exists. Then REFCLKn is disabled, and the PWRONn signal is de-asserted
within 100 ms.
5.2.2.3 PWRGDn De-Assertion
Another situation that forces a PCI Hot Plug port to power-down is the de-assertion of PWRGDn. If
PWRGDn is de-asserted, the XIO3130 switch disables REFCLKn but does not de-assert PWRONn.
PWRGDn
PWRONn#
CLKREQn#
REFCLKn
PERSTn#
Stable
Unstable
Stable
<500 ns
100 ms
>100 ms
Figure 5-6. Effect When PWFRGn Goes Low
Note that once PERSTn goes low, it must remain low for at least 100 ms.
5.2.3 PMI_Turn_Off and PME_To_Ack Messages
For information on the PME_Turn_Off and PME_To_Ack messages, see section Section 3.2.6.
132
PCI Hot Plug Implementation Overview
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