Write Timing constraint and Speed Optimization in synthesis option

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syedshan

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Hello all


I have a query regarding XIlinx XST synthesis option, that why do we need to check or uncheck the "write timing constraint" check box during synthesis setting.

I know it will write timing constraint in NGC file. But since we are giving timing constraints to the design using UCF file. So why need this.So either the UCF file will then be used in PAR or this. I am little confused in it.

If they are in collaboration what will be the hierarchy then.

Also will optimizing the speed increase my design size as I found no effect in the summary after changing the options.

Regards,

Shan
 

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