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Altera_Forum's avatar
Altera_Forum
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15 years ago

altpll component query

I am using a DE2-115 board with Cyclone IVE. When I design something in SOPC, I just use one external clock input of 50 MHz, and then I use the altpll component in Quartus MegaWizard Plugin Manager t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I've just open a pll.v file ,and I see the same words :

--- Quote Start ---

altpll_component.inclk0_input_frequency = 20000,

--- Quote End ---

(my pll's input clk is 50M too)

I change the input clk freq to 100M ,the words changes to :

--- Quote Start ---

altpll_component.inclk0_input_frequency = 10000,

--- Quote End ---

So I think the number means the period of the input clk, the unit is psec.