Why i can't mapping GATX3 to my target library?

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horzonbluz

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In my design, i use a GATX3 to gating a CLK signal. But when i synthesis my design. It reports a warning: Target library has no replacement for the register and can't produce a netlist. Why this happen?
I use DC 2003.06-DC2 UNIX version. I set dont use LAT* in my target library and don't remove integrated_attribute of GATX3.
Can somebody help me solve this problem? Thanks in advance
 

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