| # Detailed routing loops instead of straight wire... |
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| Tool: Detailed Routing |
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| Subcategory: Routing pattern anomaly |
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| ## Conversation |
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| ### oharboe |
| I've been fixing some problems in mock-array in positioning of macros and pins not being aligned and now things are working well.
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| However, I found this curious thing when inspecting, a detailed routing loop :-)
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| I don't see any reason why a horizontal wire wouldn't work here...
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| Any ideas or insights?
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| The above can be found if creating a `flow/settings.mk` file:
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| ```
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| export DESIGN_CONFIG?=designs/asap7/mock-array/config.mk
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| export MOCK_ARRAY_DATAWIDTH?=8
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| export MOCK_ARRAY_TABLE?=8 8 4 4 5 5
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| export MOCK_ARRAY_SCALE?=80
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| ```
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| and running `make verilog` and `make`
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| Various interesting things can be seen in detailed routing:
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| - almost all the wires are vertical/horizontal between "Element" macros. The loop above is untypical, usually it's just a slight horizontal/vertical deviation.
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| - there are hold cells in the middle to the right
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| Hold cells have to be placed *outside* to the right of the array, hence many non-vertical vertical wires between those two elements.
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| ### maliberty |
| @osamahammad21 any thoughts on the loop? |
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| ### oharboe |
| A feature request filed: https://github.com/The-OpenROAD-Project/OpenROAD/issues/3634 |
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