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Intel
®
82575EB Gigabit Ethernet Controller — Transmit EDB Nullifying
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
186 January 2011
The following DLLPs are supported by the 82575 as a transmitter.
6.5.3 Transmit EDB Nullifying
In case of a retrain, there is a need to guarantee that no abrupt termination of the transmit packet
occurs. For this reason, early termination of the transmitted packet is possible. This is accomplished by
appending EDB to the packet.
6.6 Physical Layer
6.6.1 Link Width
The 82575 supports a maximum link width of x4, x2, or x1 as determined by the minimum of:
• The PCIEPert SKU fuse
• The EEPROM Lane_Width field in PCIe* Initialization Configuration 3 word
InitFC1-P v2v1v0 = 000
InitFC1-NP v2v1v0 = 000
InitFC1-Cpl v2v1v0 = 000
InitFC2-P v2v1v0 = 000
InitFC2-NP v2v1v0 = 000
InitFC2-Cpl v2v1v0 = 000
UpdateFC-P v2v1v0 = 000
UpdateFC-NP v2v1v0 = 000
UpdateFC-Cpl v2v1v0 = 000
Table 60. DLLPs Initiated
Ack
Nak
PM_Enter_L1
PM_Enter_L23
PM_Active_State_Request_L1
InitFC1-P v2v1v0 = 000
InitFC1-NP v2v1v0 = 000
InitFC1-Cpl v2v1v0 = 000
InitFC2-P v2v1v0 = 000
InitFC2-NP v2v1v0 = 000
InitFC2-Cpl
1
1. UpdateFC-Cpl is not transmitted due to the infinite FC-CPL allocation.
v2v1v0 = 000
UpdateFC-P v2v1v0 = 000
UpdateFC-NP v2v1v0 = 000
Table 59. DLLPs Received