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Altera_Forum
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17 years ago

Cyclone III Clock

Hi Dear all I am new in this forume and also FPGA projects I want to use one of the cyclone III FPGAs in my project (EP3C80 probebly 8N) and I want to make sure what is the clock frequency inpu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Hi and thanks for your response

as I concluded from datasheets and pin information there are 4 pins for each PLL here in cyclone III while in Cyclone 1 it was just 2 pins for that!!!

so I want to use 2 PLLs in normal mode e.g. PLL1 and PLL2.

for PLL1 I have CLK0..CLK3 and I will connect CLK0 and CLK1 (which are differential clocks) and for PLL2 I will connect CLK4 and CLK5 to (which are differencial clocks) and as I am not using other PLLS I will connect remaining pins to GND

I'm wondering if anybody can let me know if I am doing wrong or right!!:confused:

Thanks