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Subject: inverted equivalent points
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sujittikekar1
Posts: 2
Online: User is Offline
3/11/2008 2:31 AM  
what r inverted equivalent points? how we will come to know some points are inverted equivqlent?
croy
Posts: 54
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3/17/2008 9:13 AM  
An inverted equivalent point is one that has the phase inverted.

Let's say you have a flop with an inverter in front of it. You may get slightly better synthesis results by pushing that inverter through the flop, to its output. Also necessary: flipping any asynch set and/or reset pins.

Quite a few customer will NOT allow synthesis to do this since it affects a lot of post-synthesis processes and to QoR improvement may not be real.

Conformal will look for flops with inverted phases only when 'set mapping method -phase' is used. You can also do it manually using 'add mapped point -invert'.

Chrystian
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Forums > Digital IC > Formal verification > inverted equivalent points


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