February, 2007
PCI Express Capability Registers
Register 11-28. 7Ch Slot Capabilities (All Ports) (Cont.)
Serial
EEPROM
Bit(s)
Description
Power Indicator Present
Ports
Type
Default
Upstream
0
Not valid for the upstream port.
4
0 = Power Indicator is not implemented
Downstream
Upstream
HwInit
Yes
1
0
1 = Power Indicator is implemented on the slot chassis of the
corresponding PEX 8532 downstream port
Hot Plug Surprise
Not valid for the upstream port.
0 = No device in the corresponding PEX 8532 downstream
port slot is removed from the system without prior notification
1 = Device in the corresponding PEX 8532 downstream port
slot can be removed from the system without prior notification
5
6
Downstream
Upstream
HwInit
HwInit
HwInit
Yes
Yes
Yes
0
0
Hot Plug Capable
Not valid for the upstream port.
0 = Corresponding PEX 8532 downstream port slot is not
capable of supporting Hot Plug operations
1 = Corresponding PEX 8532 downstream port slot is capable
of supporting Hot Plug operations
Downstream
Upstream
1
Slot Power Limit Value
00h
19h
00b
Do not change for upstream port.
The maximum power available from the corresponding
PEX 8532 downstream port is determined by multiplying the
value in this field (expressed in decimal; 25d = 19h) by the
value specified by the Slot Power Limit Scale field.
14:7
Downstream
Upstream
Slot Power Limit Scale
Not valid for the upstream port.
The maximum power available from the corresponding
PEX 8532 downstream port is determined by multiplying the
value in this field by the Slot Power Limit Value field.
16:15
00b = 1.0x
01b = 0.1x
10b = 0.01x
11b = 0.001x
Downstream
HwInit
Yes
00b
18:17 Reserved
Physical Slot Number
00b
Upstream
0-0h
Not valid for the upstream port.
31:19
Specifies a non-zero identification number for the
corresponding PEX 8532 downstream port slot.
Downstream
HwInit
Yes
0-0h
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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