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Negative Tolerance in Relative Propagation Delay

In Electrical constraints when we want nets in a group to be +-20mil w.r.t to a manually selected target 0:20 tolerance works fine, but before we could reach this conclusion, the tool also accepts -20:20 mil as tolerance value and the results generated are difficult to understand, what actually does it mean to have tolerance set to -20:20 mil?

steve over 5 years ago

This cell is made up of Delta:Tolerance so you are setting a Delta value with +/-20 tolerance. Take a look at www.parallel-systems.co.uk/.../Match_groups.pdf for more detail
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saicharan over 5 years ago in reply to steve

thank you , helped a lot
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