Hi, there:
I tried one simulation with the following parameters to derive a 36MHz from
40MHz crystal... It works in simulation, but does it work in Virtex-2 with speed grade of 6? I am cautious as 40 * 9 makes 360MHz and it is beyond the Virtex-2's DCM timing specification.defparam DCM1.CLKFX_DIVIDE = 10; defparam DCM1.CLKFX_MULTIPLY = 9;
I also tried to use a state machine to divide crystal into 4MHz and then multiply by 9, but it Model-Sim complained the input clock jitter was beyond 1ns...
How may I do this task?
Thanks for your advice... Kelvin