Hello what is the difference between `global placement or` a

Question

Hello what is the difference between `global placement or` and `global placement` Similarly `detailed placement or and detailed placement` It is written that one uses Replace and OpenDP while the other uses openroad But the openroad also uses Replace and OpenDP so what s the difference between the 2 < U016ULGAUNM> < U01634FSETZ> I was running the interactive mode in which `detailed placement` errored out while the `detailed placement or` ran successfully

tnt · Answer

Different version of the tools

Wajeh ul hasan · Answer

So which is recommended latest I don t understand the purpose of putting 2 different versions there

tnt · Answer

Flow seems to use the openroad version by default for most things

Wajeh ul hasan · Answer

Which makes perfect sense since that s what they defined their architecture as However the existence of the other option seems out of place

tnt · Answer

It s used for legalization for some of those substeps

tnt · Answer

I think it s because since things are still being worked out only very specific versions of some tools worked and some other were broken

tnt · Answer

At the beginning of openlane almost every tool was used split out of openroad and fixed to a specific version sometimes with sky130 fixes applied that were not in OpenRoad version Little by little things got consolidated and now almost everything is using the OpenRoad version but not everything yet