Intel® Arria® 10 Transceiver PHY User Guide

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ID 683617
Date 3/28/2022
Public
Document Table of Contents

5.1.5.5. Variable Gain Amplifier (VGA)

Arria® 10 channels have a variable gain amplifier to optimize the signal amplitude prior to the CDR sampling. VGA can only be operated in manual mode. VGA gain can be selected through Intel® Quartus® Prime Assignment Editor or Intel® Quartus® Prime Setting File (qsf) or the Avalon® memory-mapped interface register. You must set VGA manually for all combinations of CTLE and DFE modes.

Figure 230.  VGA Frequency Response for Different Gain Settings

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