xilinx dds core frequency sweep problem

[layaghi]

I'm using xilinx dds core in a spartan3 fpga.
I have already make a signal with a desired frequency.
since I change the valuse of "A", "DATA" and "WE" inputs in my VHDL code the output frequency does not changes.
how could I make the output frequency to sweep?

 

[vipinlal]

You want to change the output frequency in DDS block?

If thats what you want then while customizing the DDS block in coregen, increase the number of channels to required. I think there are max of 16 channels available each can have a unique freq. You can multiplex these output channels to get one of the 16 freqs..

I dont know a way to change the freqs just using a formula using DDS.

 

[layaghi]

Thank you dear vipinlal
I successfully programmed the dds core and it has copabilities frther than only 16 channels.
The only thing it requires is precisely working with "we", "address" and "data" inputs.

 

[permute]

have you considered just using the streaming frequency input option? IIRC Xilinx's DDS does have this option.