82576EB datasheet(16/34 Pages) INTEL

16 / 34 page

Specification Changes - Intel® 82576EB GbE Controller

Intel® 82576EB GbE Controller

Revision: 2.85

Specification Update

September 2012

Implication: Loss of link can cause a loss of the MNG session. These events do not normally occur

during a reboot cycle, so it is expected that no effect will be seen in most circumstances.

Workaround: N/A.

▼ Return to Summary

7. SerDes: AN_TIMEOUT Only Works When Link Partner Idle

Clarification: The auto-negotiation timeout mechanism (PCS_LCTL.AN_TIMEOUT_EN) only works if the

SerDes partner is sending idle code groups continuously for the duration of the timeout

period, which is the usual case. However, if the partner is transmitting packets, an auto-

negotiation timeout will not occur since auto-negotiation is restarted at the beginning of

each packet.

If the partner has an application that indefinitely transmits data despite the lack of any

response, it is possible that a link will not be established. If this is a concern, the auto-

negotiation timeout mechanism may be considered unreliable and an additional software

mechanism could be used to disable auto-negotiation if sync is maintained without a link

being established (PCS_LSTS.SYNC_OK=1b and PCS_LSTS.LINK_OK=0b) for an

extended period of time.

Note:

To Disable Auto-Negotiation when using an Intel driver, use the SerDes Forced Mode

Override bit as described in Specification Change #5.

Workaround: N/A

▼ Return to Summary

8. Padding on Transmitted SCTP Packets

Clarification: When using the 82576 to offload the CRC calculation for transmitted SCTP packets,

software should not add Ethernet padding bytes to short packets (less than 64 bytes).

Instead, the TCTL.PSP bit should be set so that the 82576 pads the packets after

performing the CRC calculation.

Workaround: N/A

▼ Return to Summary

Dynamic LED Modes Can Only Be Used in an Active Low Configuration

Clarification: In any of the dynamic LED modes (FILTER_ACTIVITY, LINK/ACTIVITY, COLLISION,

ACTIVITY, PAUSED), LED blinking should only be enabled if the LED signal is configured

as an active low output.

Workaround: N/A

▼ Return to Summary

1.5.3

Specification Changes

1. Update to PBA Number EEPROM Word Format

Change:

PBA Number Module — Word 0x8-0x9

The nine-digit Printed Board Assembly (PBA) number used for Intel manufactured

Network Interface Cards (NICs) is stored in EEPROM.

82576EB Datasheet(PDF) 16 Page - Intel Corporation

82576EB Datasheet(HTML) 16 Page - Intel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

Datasheet Download

Link URL