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Grid Check
Grid check is nothing but checking the robustness of Power/Ground network
Input files for grid analysis:LEF,DEF,.V,.PP
Factors resulting in grid failure
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Opens
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Shorts
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Missing via
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High resistance path
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Dangling nets
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Chopped metal pieces
The grid maybe made robust by ensuring the following
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By fixing the Grid issues like Opens, Shorts, Missing Via, Dangling Nets, Chopped
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Metal Pieces, Power Bumps/Pads & Stripes placement, Switch Cells Placement etc.
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By spreading high drive strength cells.
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By performing VT Swapping i.e. from LVT to HVT.
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By Load splitting.
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By fixing high resistive paths.
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By fixing narrow channel issue.
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