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NRDB-51 warning

gpremala

Hi All,

I am having Warnings after CTS,Route and PostRoute opt

WARNING (NRDB-51) SPECIAL_NET SG_rr is empty with no instance pin and special wire. Net with the same name will be routed but will not be connecte to the empty SPECIAL_NET.

The SG_rr net is too long and having approx. 30ns net delay.

By observing this I found that this net is HFN, and its net length is  approx. 14k microns, I did constarined signal net not to exceed 4000 microns.

But the tool is not able follow the net length constrain. and it doesnot add a buffer after 4000 microns.

Please provide me the solution on proper routing of HFN.

Tool SoC Encounter with version edi11. 

 

Thanks,

Gopi 

 

 

 

 

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