ICC set_keepout_margin

set_keepout_margin
[-type hard | soft]
[-outer {lx by rx ty}]
[-tracks_per_macro_pin value]
[-min_padding_per_macro value]
[-max_padding_per_macro value]
[-all_macros] [-macro_masters][-macro_instances]
[object_list]
[-north]
请叫该命令的作用?

ICCUG place 那一节一开始就介绍blockage 和 keepout margin

和edi的halo 用处一样，兼顾cell padding的功能，