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How to save global routing output (ie. guide for Detailed Routing)?

Hi,

I want to execute global routing and export the global routing output in a file, probably a .guide file such as the ones in the benchmarks of ISPD 2018 Contest (http://www.ispd.cc/contests/18/index.htm).

By global routing output I mean the sets of rectangles that act as guides for each net in detailed routing.

I am currently using Innovus tool and I didnt find the option to do it. The closest I've found is to execute Early Global Routing and then using the "saveRouteGuide" command, but this seems to be a pre-step of global routing.

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