Do I correctly assume that GLB RT MAXLAYER is only a recomme open-source-silicon #openlane

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Title

j

Jean

12/26/2020, 11:14 PM

Do I correctly assume that GLB_RT_MAXLAYER is only a recommendation? TritonRoute seems to ignore it!

t

tnt

12/26/2020, 11:20 PM

in effect yes.

I think it's a constraint for FastRoute when it creates the guides. But since the guides are just ... guides for TritonRoute, the latter can choose to ignore them if it neeeds to for routing.

a

Ahmed Ghazy

12/28/2020, 2:02 PM

You can use routing obstructions to more or less forbid routing on higher layers. (e.g.,

set ::env(GLB_RT_OBS) "met5 $::env(DIE_AREA), met4 $::env(DIE_AREA)"

)