ICC notes:
macro_keepout_margin
write_def : the def file will include the keepout margin as halo. When you read the def back in, keepout_margin will be created according to the halo size. So personally, I prefer to have def file to take care the placement only. Leave the keepout/blockage part to icc/tcl.
hard and soft keepout: both will create placement blockage, but the difference is that: hard will create blockage for sure, soft will create blockage conditionally.
Soft macro vs hard macro vs bbox
soft macro does have child.
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