PLL on DE2-70

Hi Blue1440,

The use of a PLL is very easy. You use the MegaWizard in Quartus to generate a module for the ALTPLL block. In its simplest configuration you only need an input clock inclk0 and one up to three output clocks c0, c1 and c2. In the MegaWizard you can specify your output clock frequency (by specifying the multiplication and division factors for your input clock frequency).

More information on the ALTPLL module is given here (http://www.altera.com/literature/ug/ug_altpll.pdf).

More information on PLLs in Cyclone-2 devices (such as on the DE2-70) is given here (http://www.altera.com/literature/hb/cyc2/cyc2_cii51007.pdf).

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I was also wondering what the max clk rate is that can be generated from the PLL's using the 50 MHz oscillator.

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With the Cyclone II: EP2C70F896C6 device you can use a maximum multiplication factor of your 50MHz DE2-70 input clock of 20 times. In theory this would result in a 1000 MHz clock. It will however be very difficult to make circuits work at this high speed. You will definitly only have very small circuits and need to use the TimeQuest timing analyzer.

Hope this helps...