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Autorouting matchgroups

Neha Anu

Hi all,
     
          I'm new to autorouting.I'm trying to autoroute the nets in a matchgroup MG1 having the relative propagation delay with a net set as target and moreover the same nets come under another matchgroup MG2 that has another target.But wen tried autorouting with specctra using the .do file the tool is tuning the target.As a result all the signals are not obeying the tolerance of 100 mils.
Is it possible to control the tool not to tune(delay tune) the target?Can anyone pls reply?

Thanx,
Neha

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