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RGMII Ethernet Interface Using 10/100 Magnetics

Andrew Gallardo
Prodigy 20 points
Other Parts Discussed in Thread: DP83865

We need an Ethernet interface to a RGMII, but we don't need gigabit speed.  The 10/100 interface is fine in regards to speed, but we have the constraint on the controller/FPGA side of the PHY to interface to a RGMII.  We have very limited PCB space and since the gigabit PHY magnetics tend to have a rather large board footprint, we would like to know if we can somehow use 10/100 PHY magnetics in place of the 10/100/1000 PHY magnetics.  This may not be possible, but I need to ask.

Thank You,
Andrew Gallardo