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congestion after postRoute

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bangcy

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Hi all,

After postRoute i am having a couple of spots that have lot of short due to congestion of cells placed in a small area. There are plenty of space around so i am putting in a density screen of 10%.
I use setOptMode of -moveInst to True.
I re-run optDesign -postRoute again
The tool doesn't move or spread the cells in the area that i place the density screen so the congestion is still there.

Any idea how to spread these cell out without going back to placement, cts opt .....


Thanks
 

i tried refinePlace -eco
and i still did not get the tool spread the cells out in the density screen region
 

bangcy said:
i tried refinePlace -eco
and i still did not get the tool spread the cells out in the density screen region
Click to expand...

try manual eco flow if the number of violations is small
 

bangcy said:
unfortunately the number of shorts are quite high
Click to expand...

look for a pattern. there usually is one and it can be scripted. either one family of cells (eg, look for small cells with 4 inputs) is causing the problem or the proximity to some power grid/stripe.
 

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