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How to check if a clock path is in global/regional/peripheral clock network?

Altera_Forum
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During my experiment, I try to put a clock signal driven by I/O pin in a regional clock network. I find that there seems to be three different ways to do that: 

 

1. set_instance_assignment -name CLOCK_REGION <name of regional clock region> -to <clk signal> 

2. set_location_assignment CLKCTRL_R1 -to <~clkctrl version of clk signal>  

3. set_instance_assignment -name GLOBAL_SIGNAL "regional clock" -to <clk signal> 

 

What's the difference among the above methods? Which one is commonly used? If given a clock path, how can I check if it is in global/regional/peripheral clock network after compilation? 

 

Thanks! 

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