F-Tile Triple-Speed Ethernet Intel® FPGA IP User Guide

ID 741328
Date 4/03/2023
Public

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8.1.1. MAC and PCS With LVDS Soft-CDR I/O

In configurations that contain the MAC, PCS, and LVDS Soft-CDR I/O, you have the following options in optimizing clock resources:
  • Utilize the same reset signal for all MAC instances if you do not require a separate reset for each instance.
  • Utilize the same clock source to drive the reference clock, FIFO transmit and receive clocks, and system clocks, if these clocks run at the same frequency.
Figure 77. Clock Distribution in MAC and SGMII PCS with LVDS Configuration—Optimal CaseFigure shows the optimal clock distribution scheme you can achieve in configurations that contain the MAC, SGMII PCS and LVDS Soft-CDR I/O.


Figure 78. Clock Distribution in MAC and 1000BASE-X PCS with LVDS Configuration—Optimal CaseFigure shows the optimal clock distribution scheme you can achieve in configurations that contain the MAC, 1000BASE-X PCS, and LVDS Soft-CDR I/O.