Intel® Arria® 10 Transceiver PHY User Guide

ID 683617
Date 9/15/2023
Document Table of Contents
Give Feedback Programmable Pre-Emphasis

Pre-emphasis can maximize the eye at the far-end receiver. The programmable pre-emphasis module in each transmit buffer amplifies high frequencies in the transmit data signal, to compensate for attenuation in the transmission media.

The pre-tap pre-emphasizes the bit before the transition and de-emphasizes the remaining bits. A different polarity on pre-tap does the opposite.

Table 251.  Pre-Emphasis TapsAll four pre-emphasis taps provide inversion control, shown by negative values.
Pre-Emphasis Tap Number of Settings
Second pre-tap 15
First pre-tap 33
First post-tap 51
Second post-tap 25

You can set pre-emphasis taps through the Quartus Assignment Editor, the Avalon® memory-mapped interface registers, and the QSF settings.