Data Sheet

Interconnects—Ethernet Controller I210

After timer expiration, the mechanism instructs the PHY to re-establish the link (via the LTSSM

recovery state).

3.1.4.7 Error Forwarding

If a TLP is received with an error-forwarding trailer (poisoned TLP received), the transaction can either

be resent or dropped and not delivered to its destination, depending on the GCR.Completion Timeout

resend enable bit and the GCR.Number of resends field. If the re-sends were unsuccessful or if re-send

is disabled, the I210 does not initiate any additional master requests for that PCI function until it

detects an internal reset or a software reset for the LAN. Software is able to access device registers

after such a fault.

System logic is expected to trigger a system-level interrupt to inform the operating system of the

problem. The operating system can then stop the process associated with the transaction, re-allocate

memory instead of the faulty area, etc.

3.1.5 Data Link Layer

3.1.5.1 ACK/NAK Scheme

The I210 sends an ACK/NAK immediately in the following cases:

1. NAK needs to be sent

2. ACK for duplicate packet

3. ACK/NAK before low power state entry

In all other cases, the I210 schedules an ACK transmission according to time-outs specified in the PCIe

specification (depends on link speed, link width, and max_payload_size).

3.1.5.2 Supported DLLPs

The following DLLPs are supported by the I210 as a receiver:

Table 3-10. DLLPs Received by the I210

DLLP type Remarks

ACK

NAK

PM_Request_ACK

InitFC1-P Virtual Channel 0 only

InitFC1-NP Virtual Channel 0 only

InitFC1-Cpl Virtual Channel 0 only

InitFC2-P Virtual Channel 0 only

InitFC2-NP Virtual Channel 0 only

InitFC2-Cpl Virtual Channel 0 only

UpdateFC-P Virtual Channel 0 only

UpdateFC-NP Virtual Channel 0 only

UpdateFC-Cpl Virtual Channel 0 only