DE4 User Manual
98
www.terasic.com
June 20, 2018
Figure 4
–4 System Configuration Group
Programmable PLL
There are three external programmable PLLs on-board that provide reference clocks for the
following signals HSMA_REFCLK, HSMB_REFCLK, and PLLCLKIN/SATA_REFCLK. To use
these PLLs, users can select the desired frequency on the Programmable PLL group, as show in
Figure 4–5
.
As the Quartus project is created, System Builder automatically generates the associated PLL
configuration code according to users’ desired frequency in verilog which facilitates users’
implementation as no additional control code is required to configure the PLLs.
Note. If users need to dynamically change the frequency, they would need to modify the generated
control code themselves.
Содержание ALTERA DE4
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