February, 2007
Power Management Capability Registers
Register 11-18. 44h Power Management Status and Control (All Ports)
Serial
EEPROM
Bit(s)
Description
Type
Default
Power Management Status and Control
Power State
This field is used to determine the current power state of the port, and to set the
port into a new power state.
00b = D0
01b = D1 – Not supported
10b = D2 – Not supported
11b = D3hot
1:0
RW
Yes
00b
If software attempts to write an unsupported state to this field, the Write operation
completes normally; however, the data is discarded and no state change occurs.
7:2
8
Reserved
RO
No
No
0h
0
PME Enable
0 = Disables PME generation by the corresponding PEX 8532 porta
1 = Enables PME generation by the corresponding PEX 8532 port
RWS
Data Select
RW by Serial EEPROM mode onlyb.
Bits [12:9] select the Data and Data Scale registers.
0h = D0 power consumed
RO
Yes
0h
3h = D3hot power consumed
12:9
4h = D0 power dissipated
7h = D3hot power dissipated
RO for hardware auto-configuration.
Not supported
RO
RO
No
0h
Data Scale
RW by Serial EEPROM mode onlyb.
There are four internal Data Scale registers per port.
Bits [12:9], Data Select, select the Data Scale register.
14:13
15
Yes
00b
PME Status
0 = PME is not generated by the corresponding PEX 8532 porta
1 = PME is being generated by the corresponding PEX 8532 port
RW1C
No
0
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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