Data Sheet

PCIe Programming Interface—Ethernet Controller I210
611
.
9.4.6.12 Device Control 2 (0xC8; RW)
This register controls PCIe specific parameters.
Bit
Location
R/W Default Description
3:0 RO 1111b
Completion Timeout Ranges Supported
This field indicates the I210 support for the optional completion timeout programmability
mechanism. This mechanism enables system software to modify the completion timeout value.
Description of the mechanism can be found in Section 3.1.3.2.
Four time value ranges are defined:
• Range A = 50 s to 10 ms
• Range B = 10 ms to 250 ms
• Range C = 250 ms to 4 s
• Range D = 4 s to 64 s
A value of 1111b indicates the I210 supports ranges A, B, C, & D.
4RO1b
Completion Timeout Disable Supported
A value of 1b indicates support for the completion timeout disable mechanism.
5RO0b
ARI Forwarding Supported
Applicable only to switch downstream ports and root ports; must be set to 0b for other function
types.
6 RO 0b AtomicOp Routing Supported - not supported in the I210.
7 RO 0b 32-bit AtomicOp Completer Supported – not supported in the I210.
8 RO 0b 64-bit AtomicOp Completer Supported – not supported in the I210.
9 RO 0b 128-bit CAS Completer Supported – not supported in the I210.
10 RO 0b No RO-enabled PR-PR Passing – not supported in the I210.
11 RO 1b
1
1. Value loaded from Flash word.
LTR Mechanism Supported –
A value of 1b indicates support for the optional Latency Tolerance Requirement Reporting (LTR)
mechanism capability.
Note: Value loaded from LTR_EN bit in Initialization Control Word 1 Flash word.
13:12 RO 00b TPH Completer supported - the I210 does not use the hints as a completer
17:14 RO 0x0 Reserved
19:18 RO 00b
1
Reserved
31:20 RO 0x0 Reserved