PEX 8532 Transparent Mode Port Registers
PLX Technology, Inc.
Register 11-35. 140h Power Budgeting Data (All Ports)
Serial
Default
Bit(s)
Description
Type
EEPROM
Base Power
Eight registers/port. Specifies (in Watts) the base power value in the operating
condition. This value must be multiplied by the Data Scale to produce the actual
power consumption value.
7:0
RO
Yes
00h
Data Scale
Specifies the scale to apply to the Base Power value. The power consumption of
the device is determined by multiplying the Base Power field contents with the
value corresponding to the encoding returned by this field.
00b = 1.0x
01b = 0.1x
10b = 0.01x
11b = 0.001x
9:8
RO
Yes
00b
PM Sub-State
12:10
14:13
RO
RO
Yes
Yes
000b
00b
000b = Corresponding PEX 8532 port is in the default Power Management sub-state
PM State
Current power state.
00b = D0 state
01b = Not used – D1 state not supported
10b = Not used – D2 state not supported
11b = D3 state
Type
Type of operating condition.
000b = PME Auxiliary
001b = Auxiliary
010b = Idle
011b = Sustained
111b = Maximum
All other values are reserved.
17:15
RO
Yes
Yes
000b
Power Rail
Power Rail of operating condition.
000b = Power 12V
001b = Power 3.3V
010b = Power 1.8V
111b = Thermal
20:18
RO
000b
0-0h
All other values are reserved.
31:21 Reserved
Note: There are eight registers per port that can be programmed, through the serial EEPROM. Each non-zero register
value describes the power usage for a different operating condition. Each configuration is selected by writing
to the Data Select register Data Select field (offset 13Ch[7:0]).
Register 11-36. 144h Power Budget Capability (All Ports)
Serial
Bit(s)
Description
Type
Default
EEPROM
System Allocated
0
HwInit
Yes
1
1 = Power budget for the device is included within the system power budget
31:1
Reserved
0-0h
192
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 ]
