Clocking with Lattice Parts

[samuelcomeau]

Hey,
So with the Mojo, the way to get new clocks was to use coregen via the awesome installed button. Since Cu is a Lattice part there is obviously not a coregen option. Therefore, how do I get my higher or lower clock signal?

[Geo747]

@samuelcomeau

Hey,
So with the Mojo, the way to get new clocks was to use coregen via the awesome installed button. Since Cu is a Lattice part there is obviously not a coregen option. Therefore, how do I get my higher or lower clock signal?

If you are using IceCube2 there is a PLL module generator for generating all the PLL code for different clock signals under Tools>Configure>Configure PLL Module although I must admit I havent gotten around to playing with it yet

[rrc]

You can also use the icepll tool of project IceStorm. It generates a Verilog file that contains the PLL module.
Usage example:

icepll -m -f pll.v -i 100 -o 200

This generates a 200MHz clock from 100MHz input and stores the module into pll.v.