Cyclone® V GT FPGA Development Kit User Guide

ID 792833
Date 2/21/2024
Public
Document Table of Contents

6.5.1. Clock Control Features

The Clock Control application sets the Si570 and Si571 programmable oscillators to any frequency between 10 MHz and 810 MHz.

  • The Si570 (not the Si571) oscillator drives a 1-to-6 buffer that drives a copy of the clock to the following areas of the FPGA:
    • Top, bottom, and right edges
    • REFCLK0 and REFCLK3
  • The 6th clock outputs to SMAs J4 and J7 on the board.
  • The Clock Control communicates with the MAX® V device on the board through the JTAG bus.
  • The Si570 and Si571 programmable oscillators are connected to the MAX® V device through a 2-wire serial bus.

The following figure shows the Clock Control Si570 tab, which has the same controls as the Si571 tab.

Figure 15. The Clock Control - Si570 Tab