Filter
Top Products
PCI Power Management Registers — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 195
Read and write registers programmed by software indicate the type of system interrupt request lines
the device interrupt pin is bound to. (Each PCIe* function has its own register.)
Max_Lat/Min_Gnt
This field is not used and is hardwired to 0b.
6.6.5 PCI Power Management Registers
All fields are reset on full power up. All of the fields except PME_En and PME_Status are reset on exit
from the D3cold state. If auxiliary power is not supplied, the PME_En and PME_Status fields are also
reset on exit from the D3cold state.
The tables that follow list the organization of the PCI Power Management Register block. Initial values
are marked in parenthesis and the following color notation is used.
Some fields in this section depend on the power management enable bits in EEPROM word 0Ah.
Note: The following color notation is used for reference:
The following section describes the register definitions, whether they are required or optional for
compliance, and how they are implemented in 82575.
Capability ID
The Capability ID is 1 byte at offset 40h and is read only. This field equals 01h, indicating the linked list
item as the PCI Power Management Registers.
Next Pointer
The Next Pointer is 1 byte at offset 41h and is read only. This field provides an offset to the next
capability item in the capability list. It has a value of 50h, which points to the MSI capability.
Power Management Capabilities (PMC)
The PMC is 2 bytes at offset 42h and is read only. This field describes the device functionality at the
power management states as described in the table that follows. Each device function has its own
register.
Table 64. Power Management Register Block
Byte
Offset
Byte 3 Byte 2 Byte 1 Byte 0
40h
Power Management Capabilities
(PMC)
Next Pointer (50h) Capability ID
44h Data
PMCSR_BSE Bridge
Support Extensions
Power Management Control / Status Register (PMCSR)
Fields identical to all functions.
Read only fields.
Hard coded fields and strapping options.