Question about crosstalk optimization in Celtic

[energeticdin]

Before crosstalk:

../u_2__per_round/u0__key | B v -> Y ^ | NOR2X8 | 0.116 | 1.587 | 1.506 |

After Crosstalk:

../u_2__per_round/u0_key | B v -> Y ^ | NOR2X8 | 0.116 | 1.587 | 1.513 |
| scheduler/U461

After Crosstalk Optimization:

../u_2__per_round/u0__key | B v -> Y ^ | NOR2X8 | 0.101 | 1.572 | 1.552 |
| scheduler/U461

In this NOR2X8 cell, after doing crosstalk optimization. how the delay is decreasing?
What is happening in Optimization?
I know the delay value is picking based on input transition time and output load capacitance from libraries.

 

[surendraeda]

Re: Celtic- optimization

Hi,
delay due to crosstalk effect can be reduced by upsizing the cell or applying non default rules likw(double spacing) on net metal routes or shilding.
So you can check what it is doing by inspecting both before and after optimizations.

 

[raju3295]

Celtic- optimization

from the given details, ur total dealy before and ater delay is same and increased after cross talk optimizations,, is that correct,
If i understood correctly,, can u elaborate ur question,
Please correct me if i understood wrongly