February, 2007
Hot Plug Output Signal States for Disabled Hot Plug Slots
9.1.3
Hot Plug Output Signal States for Disabled Hot Plug Slots
When a Hot Plug slot is disabled, the Hot Plug Output balls for that port are in the logic states defined in
Table 9-2.
Table 9-2. Hot Plug Outputs for Disabled Hot Plug Slot
Output Signal
HP_ATNLEDx#
HP_CLKENx#
HP_PERSTx#
Logic
High
High
Low
Comments
Attention LED is turned Off
Reference Clock is not driven to the slot
Slot remains in reset
HP_PWRENx#
HP_PWRLEDx#
High
High
Power Controller is turned Off
Power LED is turned Off
9.2
PCI Express Capability Registers for Hot Plug
The Hot Plug Configuration, Capability, Command, Status, and Events are described in Section 11.9,
“PCI Express Capability Registers.” The applicable registers are as follows:
• Slot Capabilities (offset 7Ch)
• Slot Status and Control (offset 80h)
Note: Hot Plug Slot Status and other Hot Plug control-related registers are “don’t care”
for the NT Port Virtual Interface, and should not be modified by the user.
ExpressLane PEX 8532AA/BA/BB/BC 8-Port/32-Lane Versatile PCI Express Switch Data Book
Copyright © 2007 by PLX Technology, Inc. All Rights Reserved – Version 1.6
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