Can't connect with 100Mbit

Question

Our ethernet board is working properly, but only with a speed of 10Mbit. I run the following initialisation code: wiz_PhyConf cnf; // Ethernet controller CHIPUNLOCK(); mr2 = (uint8_t)getMR2() | 0x80; //MR2_CLKSEL; setMR2(mr2); CHIPLOCK(); PHYUNLOCK(); setPHYCR0(0x02); setPHYCR1(0x01); PHYLOCK(); cnf.mode = PHY_MODE_MANUAL; cnf.speed = PHY_SPEED_100; cnf.duplex = PHY_DUPLEX_FULL; ctlwizchip(CW_SET_PHYCONF, (wiz_PhyConf*)&cnf); But when I read PHYSR, it returns 0x13, indicating 10Mbit has been selected. This is also confirmed at the LEDs of the router. What am I missing not to have the controller running at 100 Mbit? Or could it also be a faulty hardware design? Thanks in advance

Eugeny · Answer

Daan: setPHYCR0(0x02); setPHYCR1(0x01); There seem to be a mistake for PHYCR0 in datasheet as it says Auto Negotiation If AUTO is set to ‘1’, SPD and DPX are ignored. 1 : Disable Auto Negotiation 0 : Enable Auto Negotiation and it is not clear if bit should be 0 or 1. I propose you to play with this bit, and not set PHYCR0’s bit 1 to 1.

Daan · Answer

Thank you Eugeny, that was the trick! PHYCR0 bit 1 should not be set. Now it’s running at 100Mbit