Tool/software:
For DP83867, and all RGMII PHYs within our portfolio, all pins marked with TX prefix (TX_D0-3, TX_EN, TX_CLK) are inputs to the PHY when operating in RGMII. The only timing specifications that are required for the input of the RGMII communication of PHY are setup and hold time, per datasheet. Rise and fall time are output characterizations of the PHY's RGMII transmitting signals (RX_DV, RX_D0-3, RX_ER, RX_CLK).