Data Sheet

Ethernet Controller I210 —PCIe Programming Interface
608
9.4.6.7 Link Capabilities Register (0xAC; RO)
This register identifies PCIe link specific capabilities. This is a read only register
Bits Rd/Wr Default Description
3:0 RO 0010b
Max Link Speed
This field indicates the supported Link speed(s) of the associated link port. Defined
encodings are:
0001b = 2.5 Gb/s Link speed supported.
0010b = Not supported (5 Gb/s and 2.5 Gb/s Link speeds)
9:4 RO 0x01
Max Link Width
Indicates the maximum link width. The I210 can support by 1 link width.
Relevant encoding:
000000b = Reserved.
000001b = x1.
000010b = x2 Not supported.
000100b = x4 Not supported.
11:10 RO 11b
Active State Power Management (ASPM) Support – This field indicates the level of
ASPM supported on the I210 PCI Express Link.
Defined encodings are:
00b = No ASPM Support.
01b = L0s Supported.
10b = L1 Supported.
11b = L0s and L1 Supported.
14:12 RO
Usage depended.
See default values in
Section 6.2.14.
L0s Exit Latency
Indicates the exit latency from L0s to L0 state.
000b = Less than 64ns.
001b = 64ns – 128ns.
010b = 128ns – 256ns.
011b = 256ns - 512ns.
100b = 512ns - 1 s.
101b = 1 s – 2 s.
110b = 2 s – 4 s.
111b = Reserved.
Depending on usage of common clock or separate clock the value of this field is
loaded from PCIe Init Config 1 Flash word, 0x18 (See Section 6.2.14).
17:15 RO
Usage depended.
See default values in
Section 6.2.11.
L1 Exit Latency
Indicates the exit latency from L1 to L0 state.
000b = Less than 1 s.
001b = 1 s - 2 s.
010b = 2 s - 4 s.
011b = 4 s - 8 s.
100b = 8 s - 16 s.
101b = 16 s - 32 s.
110b = 32 s - 64 s.
111b = L1 transition not supported.
Depending on usage of common clock or separate clock the value of this field is
loaded from PCIe L1 Exit latencies Flash word, 0x14 (See Section 6.2.11).
18 RO 0b
Clock Power Management Status
Not supported in the I210. RO as zero.
19 RO 0b
Surprise Down Error Reporting Capable Status
Not supported in the I210. RO as zero
20 RO 0b
Data Link Layer Link Active Reporting Capable Status
Not supported in the I210. RO as zero.