Jun 15, 2017 #1 I inputoutput Member level 1 Joined Mar 18, 2017 Messages 32 Helped 2 Reputation 4 Reaction score 2 Trophy points 8 Activity points 231 I am doing a post-CTS timing optimization in Encounter. During the optimization the summary report is something as follows: WNS (ns) -3.751 TNS (ns) -26643.7 Violating Paths: 21986 All Paths: 67386 However, after optimization is complete, timing actually gets much worse: WNS (ns) -23.290 TNS (ns) -52498 Violating Paths: 20655 All Paths: 67306 I don't think this result is at all realistic. What could be the problem here?
I am doing a post-CTS timing optimization in Encounter. During the optimization the summary report is something as follows: WNS (ns) -3.751 TNS (ns) -26643.7 Violating Paths: 21986 All Paths: 67386 However, after optimization is complete, timing actually gets much worse: WNS (ns) -23.290 TNS (ns) -52498 Violating Paths: 20655 All Paths: 67306 I don't think this result is at all realistic. What could be the problem here?
Jun 15, 2017 #2 T ThisIsNotSam Advanced Member level 5 Joined Apr 6, 2016 Messages 2,549 Helped 397 Reputation 794 Reaction score 464 Trophy points 1,363 Activity points 14,768 inputoutput said: I am doing a post-CTS timing optimization in Encounter. During the optimization the summary report is something as follows: WNS (ns) -3.751 TNS (ns) -26643.7 Violating Paths: 21986 All Paths: 67386 However, after optimization is complete, timing actually gets much worse: WNS (ns) -23.290 TNS (ns) -52498 Violating Paths: 20655 All Paths: 67306 I don't think this result is at all realistic. What could be the problem here? Click to expand... Do you have multiple corners? Sometimes the summary is based on one corner/mode, not on all the views.
inputoutput said: I am doing a post-CTS timing optimization in Encounter. During the optimization the summary report is something as follows: WNS (ns) -3.751 TNS (ns) -26643.7 Violating Paths: 21986 All Paths: 67386 However, after optimization is complete, timing actually gets much worse: WNS (ns) -23.290 TNS (ns) -52498 Violating Paths: 20655 All Paths: 67306 I don't think this result is at all realistic. What could be the problem here? Click to expand... Do you have multiple corners? Sometimes the summary is based on one corner/mode, not on all the views.
Jun 15, 2017 #3 I inputoutput Member level 1 Joined Mar 18, 2017 Messages 32 Helped 2 Reputation 4 Reaction score 2 Trophy points 8 Activity points 231 ThisIsNotSam said: Do you have multiple corners? Sometimes the summary is based on one corner/mode, not on all the views. Click to expand... No, it's just one corner. I'm getting lots of violations during nanoroute though, I don't know if that plays a role...
ThisIsNotSam said: Do you have multiple corners? Sometimes the summary is based on one corner/mode, not on all the views. Click to expand... No, it's just one corner. I'm getting lots of violations during nanoroute though, I don't know if that plays a role...
Jun 15, 2017 #4 T ThisIsNotSam Advanced Member level 5 Joined Apr 6, 2016 Messages 2,549 Helped 397 Reputation 794 Reaction score 464 Trophy points 1,363 Activity points 14,768 inputoutput said: No, it's just one corner. I'm getting lots of violations during nanoroute though, I don't know if that plays a role... Click to expand... It does. If nanoroute fails, it will still keep a partial solution. This solution can have loops, unconnected wires, all sorts of weird shapes. Any timing optimisation applied to it is pointless.
inputoutput said: No, it's just one corner. I'm getting lots of violations during nanoroute though, I don't know if that plays a role... Click to expand... It does. If nanoroute fails, it will still keep a partial solution. This solution can have loops, unconnected wires, all sorts of weird shapes. Any timing optimisation applied to it is pointless.