I am looking to do test of the 83848 with the DP83848I-MAU-EK/NOPB prototyping board. What I need to do is send data from a bit error rate tester (BERT) through the RJ45, into the phy and then back to the BERT. I can't seem to find any far end loop test option similar to the 83867. I am using the usb2mdio tool with the MSP430. I can read and write to the PHY on this prototyping board. I thought to use these settings.
//Reset on BMCR
//Set BMCR to loopback B14 and auto-neg B12
But, realized after I started it that it wasn't the loopback mode I wanted and was actually looping back the wrong direction. Then I thought I could just jumper the Tx3:0 pins to the RX3:0 pins and maybe the rxclk to the txclk and none of this seems to be working. Any suggestions would be greatly appreciated. What I need to do is test the phy under extremes of environments. Please and thank you.