PEX 8532 Transparent Mode Port Registers
PLX Technology, Inc.
Register 11-29. 80h Slot Status and Control (All Ports) (Cont.)
Serial
EEPROM
Bit(s)
Description
Ports
Slot Status
Type
Default
Attention Button Pressed
Upstream
Downstream
Upstream
RO
RW1C
RO
No
Yes
No
0
0
0
0
Not valid for the upstream port.
16
Set to 1 when the Attention Button of the
corresponding PEX 8532 downstream port slot is
pressed.
Power Fault Detected
Not valid for the upstream port.
17
18
Set to 1 when the Power Controller of the
corresponding PEX 8532 downstream port slot
detects a Power Fault at the slot.
Downstream
RW1C
Yes
MRL Sensor Changed
Upstream
Downstream
Upstream
RO
RW1C
RO
No
Yes
No
0
0
0
Not valid for the upstream port.
Set to 1 when an MRL state change is detected on the
corresponding PEX 8532 downstream port slot.
Presence Detect Changed
Not valid for the upstream port.
Set to 1 when a Presence Detect Change is detected
on the corresponding PEX 8532 downstream
port slot.
A Presence Detect Changed event is triggered from
one of two sources, depending on the state of the
HPC Inband Presence Detect Enable bit (1E0h[5]):
19
•
If the HPC Inband Presence Detect Enable bit
is cleared (offset 1E0h[5]=0, default), Presence
Detect is input from the HP_PRSNTx# signal
on the corresponding PEX 8532
Downstream
RW1C
Yes
0
downstream port
•
If the HPC Inband Presence Detect Enable bit
is set (offset 1E0h[5]=1), Presence Detect is
input from the SerDes Receiver Detect on the
corresponding PEX 8532 downstream port
188
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
PLX [ PLX TECHNOLOGY ]
