Hi, in the in the user proj example is defined the die area as

set ::env(DIE_AREA) "0 0 900 600"

is this the maximum size for the user proj in caravel? or is only an example an can be increase?

It is just an example. You can change it to fit your need.

so witch value is the maximum that still fits in caravel?

check the config for the user project area

where is that file? is the user project wrapper ?

from memory, the user project wrapper includes some config from another directory called user project wrapper empty

The maximum size is:

set ::env(DIE_AREA) "0 0 2920 3520"

You can find it in 'caravel/openlane/user_project_wrapper_empty/fixed_wrapper_cfgs.tcl'

Thanks a lot for the help 😀

set ::env(DIE_AREA) "0 0 900 600" #this is size of example macro.

regarding this, are you constraining your design size in any way? Based on @Tayyeb Mahmood comment would it be reasonable to

set ::env(DIE_AREA "0 0 2820 3420

or perhaps a little smaller for the actual user design that is within

user_project_wrapper

?

Because user_project_wrapper has no std cells, a 50um HALO works best to connect IO, but macroplacer does not respect that, at least in my work. Therefore, it is best to place it manually by using macro.cfg.