IDT 89HPES48T12G2, User Manual

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IDT PCI to PCI Bridge and Proprietary Port Specific Registers
PES48T12G2 User Manual 15 - 48 April 5, 2013
PWRBDSEL - Power Budgeting Data Select (0x284)
PWRBD - Power Budgeting Data (0x288)
PWRBPBC - Power Budgeting Power Budget Capability (0x28C)
PWRBDV[7:0] - Power Budgeting Data Value [7:0] (0x300 - 0x31C)
Bit
Field
Field
Name
Type
Default
Value
Description
7:0 DVSEL RW 0x0 Data Value Select. This field selects the Power Budgeting Data
Value (PWRBDVx) register whose contents are reported in the
Data (DATA) field of the Power Budgeting Data (PWRBD) register.
Setting this field to a value greater than 7, causes zero to be
returned in the DATA field of the PWRBD register.
31:8 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
31:0 DATA RO 0x0 Data. If the Data Value Select (DVSEL) field in the Power Budget-
ing Data Select register contains a value of zero through 7, then
this field returns the contents of the corresponding Power Budget-
ing Data Value (PWRBDVx) register. Otherwise, this field contains
a value of zero.
Bit
Field
Field
Name
Type
Default
Value
Description
0 SA RWL 0x0 System Allocated. When this bit is set, it indicates that the power
budget for the device is included within the system power budget
and that reported power data for this device should be ignored.
If the power budgeting capability is used, then this field should be
initialized with data from a serial EEPROM.
31:1 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
31:0 DV RW Undefined
Sticky
Data Value. This 32-bit field is used to hold power budget data in
the format described in Section 7.15.3 in the PCI Express 2.0 Base
Specification.
This field may be read and written when the Power Budgeting Data
Value Unlock (PWRBDVUL) bit is set in the Switch Control
(SWCTL) register. When the PWRBDVUL bit is cleared, this regis-
ter is read-only and writes are ignored.
If the power budgeting capability is used, then this field should be
initialized with data from a serial EEPROM.