[PCB_FORUM] Swapping to minimize crosses
- From: pcbrunner@xxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Sat, 11 Feb 2006 03:36:14 +0000
After Component Placement and Autoswap-Gates/Pins using the Virtual wirelength
reduction algorithym I am still left with many crosses in my rats which could
be removed, but because they do not reduce the overall length they do not get
swapped, however, removing the crosses would be preferreable as a solution for
this design as I think it would be for many.
I have spent much time with the placement, customized the fanout to optimize
routing and help eliminate crosses but I am still looking at spending more time
manually swapping gates to eliminate hourglasses. This is critical as these
runs can not use vias other than fanout and their length must be as short as
possible.
I would like to get it done right the first time as we are not closely coupled
with the Front end tool and the backannotation process unfortunately is not
'pushbutton' and I would like to reduce cycles in that area as well.
Is anyone aware of a function that could speed this 'swap/rats crosses' process
up? Any help would be appreciated. Thank You.
-Lcan Rekahs
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