Using DCM with Spartan 3

[agent_009]

I want to know that what is the exact method of getting a clock using DCM(Digital Clock Manager) for Xilinx Spartan 3 FPGA. Currently i am using ISE 6.0

Thanx in advance

 

[yasser_shoukry]

You can use IPcore generator from ISE to create an instance from the DCM with the required parameters.

 

[echo47]

Please define more clearly "getting a clock". There are different ways of using a DCM depending on what you need to do. Many designs don't need any DCMs.

You can use coregen to build a DCM core as yasser_shoukry suggested, or you can instantiate the DCM primitive directly into your HDL (see the DCM section of your ISE Libraries Guide).

 

[sprao]

This following link is helpful for you :
https://www.xilinx.com/bvdocs/appnotes/xapp462.pdf

 

[agent_009]

I have used the core for "Single DCM" and added it into my project. But when i configure it on the Spartan 3, it uses it's default clock rather than the DCM component i have added.
How can i make it use the DCM generated clock instead of it's default clock?

 

[echo47]

You need to instantiate the DCM core in your HDL, and then connect the core's inputs and outputs to wherever you need them to go.