February, 2007
PEX 8532 PCI Express Power Management Support
Table 10-2. Supported PCI Express Power Management Capabilities (Cont.)
Register
Supported
Description
Offset
Bit(s)
Yes
No
Device Capabilities
Endpoint L0s Acceptable Latency
✔
✔
8:6
Because the PEX 8532 is a switch and not an endpoint, it does not support this feature.
000b = Disables the capability
Endpoint L1 Acceptable Latency
11:9
Because the PEX 8532 is a switch and not an endpoint, it does not support this feature.
000b = Disables the capability
Attention Button Present (Upstream Port)
For the PEX 8532 upstream port, value of 1 indicates that an Attention Button
is implemented on that adapter board.
12
13
✔
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.
Do not change for downstream ports.
Attention Indicator Present (Upstream Port)
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.
✔
Do not change for downstream ports.
6Ch
Power Indicator Present (Upstream Port)
For the PEX 8532 upstream port, value of 1 indicates that a Power Indicator is
implemented on the adapter board.
✔
14
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.
Do not change for downstream ports.
Captured Slot Power Limit Value (Upstream Port)
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.
✔
25:18
Do not change for downstream ports
Captured Slot Power Limit Scale (Upstream Port)
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
✔
27:26
01b = 0.1
10b = 0.01
11b = 0.001
Do not change for downstream ports.
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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