The document states that the frequency of ddr_dqs_base_clk output from the SDRAM PLL of Arria® V SoC varies depending on the speed grade.
SoC FPGA
clock/PLL
Category: SoCs
tool:-
Device: Arria® V
ddr_dqs_base_clk is the same frequency as the operating frequency.
You can check the SDRAM PLL output frequency by entering the reference clock, preloader, and SDRAM PLL settings from the RocketBoards.org web page below.
http://rocketboards.org/foswiki/view/Documentation/PreloaderClockingCustomization131
(See Preloader Parameters and Compute Clocks.)
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