Data Sheet
PCIe Programming Interface—Ethernet Controller I210
595
9.3.16 Cap_Ptr (0x34; RO)
The Capabilities Pointer field (Cap_Ptr) is an 8-bit field that provides an offset in the device's PCI
configuration space for the location of the first item in the Capabilities Linked List (CLL). The I210 sets
this bit and implements a capabilities list to indicate that it supports PCI power management, Message
Signaled Interrupts (MSIs), and PCIe extended capabilities. Its value is 0x40, which is the address of
the first entry: PCI power management.
9.3.17 Interrupt Line (0x3C; RW)
Read/write register programmed by software to indicate which of the system interrupt request lines this
I210's interrupt pin is bound to. See the PCIe definition for more details.
9.3.18 Interrupt Pin (0x3D; RO)
Read only register. Always report INTA#.
9.3.19 Max_Lat/Min_Gnt (0x3E; RO)
Not used. Hardwired to zero.
9.4 PCI Capabilities
The first entry of the PCI capabilities link list is pointed by the Cap_Ptr register. The following tables
describes the capabilities supported by the I210.
9.4.1 PCI Power Management Capability
All fields are reset on full power-up. All of the fields except PME_En and PME_Status are reset on exit
from D3cold state. If aux power is not supplied, the PME_En and PME_Status fields also reset on exit
from D3cold state.
See the detailed description for registers loaded from the Flash at initialization time. Behavior of some
fields in this section depend on the Power Management bit in Flash word 0x0A.
Table 9-7. PCI capabilities
Address Item Next Pointer
0x40-47 PCI Power Management 0x50
0x50-67 Message Signaled Interrupt 0x70
0x70-8B Extended Message Signaled Interrupt 0xA0
0xA0-DB PCIe Capabilities 0xE0/0x00
1
1. Next pointer is 0x00 if the VPD area in the Flash does not exist. In mode, the PCIe capability is the last capabilities section.
0xE0-0xE7 Vital Product Data Capability 0x00
Byte Offset Byte 3 Byte 2 Byte 1 Byte 0
0x40 Power Management Capabilities Next Pointer (0x50) Capability ID (0x01)
0x44 Data
Bridge Support
Extensions
Power Management Control & Status