Intel® Arria® 10 Transceiver PHY User Guide

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ID 683617
Date 3/28/2022
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8.5.3. Decision Feedback Equalizer (DFE) Settings

The decision feedback equalizer (DFE) amplifies the high frequency component of a signal without amplifying the noise content. The DFE removes the post-cursor Inter Symbol Interference (ISI) of the bits received previously from the current bit and improves the Bit Error Rate (BER). The DFE architecture supports eleven fixed taps. The fixed taps in DFE remove the ISI of the previous 11 bits from the current bit.

The DFE circuit stores delayed versions of the data. The stored bit is multiplied by a coefficient and then summed with the incoming signal. The polarity of each coefficient is programmable.

Note: The DFE fixed tap assignments are described in the following section.

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