We are using DP83867ISRGZT for 100 Mbps Ethernet. The MDI A and B channels of the TI PHY are routed to an asymmetric transformer. It does not appear that an asymmetric transformer supports MDI cross over so it is critical that the Tx/Rx assignments are fixed. Does TI agree? Based on Figure 26 in the DP83867ISRGZT datasheet and RJ-45 standard pin definitions, I believe MDI channel A of the PHY is the transmit pair and B is the receive pair. Does TI agree? If I connect the PHY transmit (channel A) to the transformer transmit pins and the PHY receive (channel B) to the transformer receive pins, then I believe I would just need to set PHYCR[6] to 0 to disable MDI crossover. I am not sure what bit 5 should be set to. Based on figure 26, I believe bit 5 should also be set to 0 (MDI configuration). Please advise.
