PEX 8532 Transparent Mode Port Registers
PLX Technology, Inc.
Register 11-24. 6Ch Device Capabilities (All Ports) (Cont.)
Serial
Default
Bit(s)
Description
Attention Button Present
Ports
Type
EEPROM
For the PEX 8532 upstream port, value of 1 indicates that
an Attention Button is implemented on that adapter board.
The PEX 8532 Serial EEPROM register initialization
capability is used to change this value to 0, indicating that an
Attention Button is not present on an adapter board for which
the PEX 8532 provides the system interface.
Upstream
Downstream
Upstream
HwInit
RO
Yes
No
Yes
No
Yes
No
1
0
1
0
1
12
Not valid for downstream ports.
Attention Indicator Present
For the PEX 8532 upstream port, value of 1 indicates that an
Attention Indicator is implemented on the adapter board.
The PEX 8532 Serial EEPROM register initialization
capability is used to change this value to 0, indicating that an
Attention Indicator is not present on an adapter board for which
the PEX 8532 provides the system interface.
HwInit
RO
13
Not valid for downstream ports.
Downstream
Upstream
Power Indicator Present
For the PEX 8532 upstream port, value of 1 indicates that
a Power Indicator is implemented on the adapter board.
The PEX 8532 Serial EEPROM register initialization
capability is used to change this value to 0, indicating that a
Power Indicator is not present on an adapter board for which
the PEX 8532 provides the system interface.
HwInit
RO
14
Not valid for downstream ports.
Downstream
0
17:15 Reserved
Captured Slot Power Limit Value
000b
For the PEX 8532 upstream port, the upper limit on power
supplied by the slot is determined by multiplying the value in
this field by the value in the Captured Slot Power Limit Scale
field.
Upstream
RO
RO
Yes
No
00h
0
25:18
Not valid for downstream ports.
Downstream
Captured Slot Power Limit Scale
For the PEX 8532 upstream port, the upper limit on power
supplied by the slot is determined by multiplying the value in
this field by the value in the Captured Slot Power Limit Value
field.
00b = 1.0
01b = 0.1
10b = 0.01
11b = 0.001
Upstream
RO
RO
Yes
No
00b
27:26
Not valid for downstream ports.
Downstream
0
31:28 Reserved
0h
176
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 ]
