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You are trading routability at the block level vs at the top level. The right tradeoff can be design specific. |
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Which layers that can be used in a macro for routing is limited to the top PDN layer.
Is there a reason not to move the PDN to higher metal layers in these files to allow using more routing layers?
https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/blob/edcd265180fc6f2edc04b6743920fc027c56c797/flow/platforms/asap7/openRoad/pdn/BLOCK_grid_strategy.tcl#L32C1-L32C44
https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/blob/edcd265180fc6f2edc04b6743920fc027c56c797/flow/platforms/asap7/openRoad/pdn/BLOCKS_grid_strategy.tcl#L28C1-L28C44
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