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Questions about ADCs

[size=2]I input signals into ADCs on FMC150.[/size]
[size=2]After the signals are transmitted to FPGA via LPC, I changed them from the differential scheme to single-ended one by Xilinx component "ibufds". Then, I used "iddr" to change the data from double data rate to single data rate.[/size]
[size=2]But I got the following error during compilation.[/size]

[size=2]ERROR:Pack:1107 - Pack was unable to combine the symbols listed below into a [font=Verdana]single IOB component because the site type selected is not compatible. [/font][/size]

[size=2][font=Verdana]Can anybody help?[/font][/size]
[size=2][font=Verdana]Thank you![/font][/size]

This topic is being closed because the issue is considered as resolved by 4DSP. Feel free to create a new topic for any further inquiries.
[font=Verdana]Thank you for your help.[/font]
I solved this problem.
Dear Sir,

is there anything I can do before to close this topic?

Best Regards,

Dear Sir,

Please contact Xilinx technical support for Xilinx compilation errors.

Do you have any problem using our reference design, because it works on LPC. You can simply attach loopback cable and run the application, everything works out of the box.