Other Parts Discussed in Thread: DP83869
Tool/software:
Dear TI,
In order to enable a more direct PCB Layout between PHY and Signal Transformer, we are trying to understand the proper usage of Mirror Mode on the DP83869 PHY. We have bootstrapped the PHY to Mirror Mode by adding a 2.49K pullup resistor to the RX_CTRL pin.
Can you tell us:
1. In the attached snip, have we reordered the TDD signals correctly to implement Mirror Mode?
2. If we have Auto-Negotiate and Mirror Mode enabled, can auto-negotiate still choose the best data rate of the three options?
3. The datasheet text under Table 7-4 indicates the polarity of the signals must be reversed in Mirror Mode. Does this mean we must also swap the polarity of the reordered signals on the schematic? In other words, the "P" side of the differential pair would go to the "N" side of the signal transformer, and vice-versa?
Thank you for your clarification.
