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When I run DC synthesis (DC version : W-2024.09-SP1), the log has following message :

"Information: In design 'register_ctrl', the register 'A_reg' is removed because it is merged to 'B_reg'. (OPT-1215)"


But I want to keep "A_reg" and let "B_reg" is removed. How to set DC constrain？

I have try to set dont_touch for "A_reg" ,  but it still not work.


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