Tool/software:
We are using the 1G DP83867CR ethernet PHY and have a few questions.
We have a layout constraint that requires the transformer and external signal launches to be located 12-18 inches away from the microcontroller. The DP83867 datasheet layout guidelines specify a maximum of 6 inches for the RGMII interface. Can we extend the MDI side signals up to 12 inches as long as we adhere to impedance control and length matching rules?
What is the drive strength of the RGMII RX signals? The only clue in the datasheet is the Ioh and Iol of 4mA for Voh and Vol specs.
The output impedance of MAC I/Os are trimmed internally to 50 ohms per the datasheet page 101. This means to me that we do not need to source terminate if we control our trace impedance to 50 ohms, correct?
Thanks,
Brian