Honored Contributor
Honored ContributorI did this on the DE2-115, writing my own controllers, and made some observations on the way:
1. The PHY is hardwired on the board to autonegotiate a link, it will do this before and after a hardware reset. Just insert a network cable and it works. 2. You can control the chip using the two basic management registers over MDIO, which is pretty straightforward. Use a statemachine that read/writes off the MDIO port@MDC clock. 3. In Gb mode tx and rx data is in double data rate. TX/RX is done like this, http://www.hp.com/rnd/pdfs/rgmiiv1_3.pdf (http://www.hp.com/rnd/pdfs/rgmiiv1_3.pdf) M.
