Clocking Wizard

[jasonkh12]

I am new to FPGA. I know that nexys2 board (Spartan3E) has 50MHz oscillator. Is there a way to generate 100MHz clock, since Clocking Wizard in IP Core does not support this board? 

 

Thanks

[zygot]

1 hour ago, jasonkh12 said:

Wizard in IP Core does not support this board

Where'd you get that idea? Spartan 3 devices have DCM blocks so it is certainly possible to create a 100 MHz clock from a 50 MHz input. You are of course using ISE since Vivado doesn't support older devices. If you don't find what you are looking for in the IP you can always instantiate a DCM as a macro in Verilog ro VHDL. Sometimes, like the Genesys Vritex5 it's not obvious from the selection of clocking IP how to get what you want. The solution is to learn about the device and instantiating resources as macros from the literature.

 

[jasonkh12]

Thank you @zygot, 

Yes, I am using ISE. The Clocking Wizard is greyed out in IP Core and cannot be selected. I will try to instantiate it as macros. Thank you.