February, 2007
Hot Plug Signals
Table 3-4. PEX 8532 Hot Plug Signals – 72 Balls (Cont.)
Signal Name
Type
Location
Description
Hot Plug Power Fault Input for Station 0 Ports (4 Balls)
Active-Low input that indicates the slot’s external Power Controller detected
a power fault on one or more supply rails.
Enabled when the Slot Capabilities register Power Controller Present bit is set
(offset 7Ch[1]=1), and input assertion status is latched in the Slot Status
register Power Fault Detected bit (offset 80h[17]).
When the following conditions exist:
•
HP_PWRFLTx# is not masked (Slot Control register Power Fault
Detector Enable bit (offset 80h[1]=1), and
Slot Control register Hot Plug Interrupt Enable bit is set
(offset 80h[5]=1),
I
M34, AA34,
N1, AB1
HP_PWRFLT[3:0]#
PUa
•
an interrupt (MSI, or INTx message, both mutually exclusive) can be
generated, to notify the Host of a power fault.
Note: If HP_PWRENx# and HP_CLKENx# are not used, HP_PWRFLTx#
can be used as a general-purpose input with status reflected in the Slot Status
register Power Fault Detected (offset 80h[17]), provided the Slot Capabilities
register Power Controller Present bit is set (offset 7Ch[1]=1).
Hot Plug Power Fault Input for Station 1 Ports (4 Balls)
Refer to description for HP_PWRFLT[3:0]#.
I
AC33, P33,
AD2, R2
HP_PWRFLT[11:8]#
HP_PWRLED[3:0]#
HP_PWRLED[11:8]#
PUa
Hot Plug Power LED Output for Station 0 Ports (4 Balls)
Active-Low Slot Control Logic output used to drive the Power Indicator. This
output is set Low to turn On the LED. Enabled when the Slot Capabilities
register Power Indicator Present bit is set (offset 7Ch[4]=1), and controlled
by the Slot Status register Power Indicator Control field (offset 80h[9:8]).
When software writes any value other than 00b (Reserved) to the Power
Indicator Control field and a Power_Indicator message is sent to
the downstream device, a Command Completed interrupt can be generated
to notify the Host that the command has been executed.
When the following conditions exist:
T34, AE34,
U1, AF1
O
•
•
•
Slot Capabilities register Power Indicator Present bit is set
(offset 7Ch[4]=1), and
Slot Control register Command Completed Interrupt Enable bit
is not masked (offset 80h[4]=1), and
Slot Control register Hot Plug Interrupt Enable bit is set
(offset 80h[5]=1),
an interrupt (MSI, or INTx message, both mutually exclusive) can be generated
to the Host.
An external current-limiting resistor is required.
Hot Plug Power LED Output for Station 1 Ports (4 Balls)
Refer to description for HP_PWRLED[3:0]#.
W33, K33,
Y2, L2
O
a. If Hot Plug outputs (including HP_PERSTx#) are used and HP_MRLx# input is not used, pull HP_MRLx# input
Low so that Hot Plug outputs (including HP_PERSTx#) will properly sequence if the serial EEPROM is blank
or missing. Default register values enable HP_MRLx#, which must then be asserted to cause Hot Plug outputs
to toggle (for example, to de-assert HP_PERSTx# and assert HP_PWRLEDx#).
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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