How to use differential clock pin of SpartanIIE?

I try to use differential clock pin with component "ibufgds", but ise5.1i reports error:"SpartanIIE doesn't support symbol ibufgds". The online documentation of ise5.1i says "ibufgds" is N/A in SpartanIIE. How can I use differential clock pin of SpartanIIE?

Thanks Warine

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Warine
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