5.2.1 EQ Far-End Loopback

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Far-end serial loopback (receiver to transmitter) or EQ FELB bypasses all input equalization (CTLE and DFE) as detailed in Receiver and therefore, only supports lower speed operation since these features cannot be utilized.

Because it does not use the CDR (the receive and transmit lanes are essentially shorted together), there is no PPM relationship between the receive and transmit data.

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