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Altera_Forum
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13 years ago

Ethernet autonegotiation

I am just wondering what kind of procedures are running during the link establishment in 100Base-T ethernet in case auto negotiation is disabled (i.e. forced mode) at both ends of the ethernet con...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

The actual PMD spec for 100Base-TX is covered by the FDDI TP-PMD standard, it's not in 802.3. It's a 3 level analog signal, nothing you can interface an FPGA directly to without some external components. If you're attaching to a PHY, all you need is an MII, and you can obtain link status (etc) from the PHY's MDIO interface.