Hello Guys, I have to divide an clock by 2.5. I cannot use the DCM of virtex 2 pro has my clock is 10 MHZ which is too less for the DCM to handle. I think this division can be done using state machine (posedge and negedge).....but i cannot figure out on what state should i derive the clock and how many state are required??
Can any one please provide suggestions
thanks and regards williams
Philip Freidin Fliptronics
Philip Freidin wrote: :
From which the following reference is particularly relevant, as it includes a divide-by-2.5 circuit:
Richard.
Untrue. Use the DCM to multiply by 4 using the CLKFX mode. The minimum CLKIN is 1MHz in this case, CLKFX output still has a minimum of 24MHz but that's OK as you've now got 40MHz. Divide that by 10. Cheers, Syms.
"The multiply by 4 in the DCM, divide by 10 in the fabric" has the advantage that it is insensitive to the incoming 10 MHz duty cycle. And you can even get a perfect 50% output duty cycle if you do the divide-by-10 the right way around.
Peter Alfke, Xilinx Applications
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.