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Altera_Forum's avatar
Altera_Forum
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18 years ago

Ethernet Link

Hi All, I have come across a very strange problem with ethernet board which has National's 83848M (Fast Ethernet) phy. When I connect this board with PC having Gigabit ethernet NIC or 10/100 Sw...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

An Ethernet transformer that is auto-midx compatible has the same circuits on the TX/RX pairs, to ensure that they can be switched by the PHY. But as you are already using a crossover cable, the problem doesn't come from mdix anyway.

Do both ends have autonegotiation enabled? For the PC you can change this in the network driver settings usually, and for the PHY you must look for the correct MDIO registers. You could try disabling the autonegotiation and force both ends at 100Mbits/s.