IO Pad Number Mismatch Fixes
The LVA fixer updates the die abstract or die layout by adding/deleting the IO pads while fixing in Edit-in-Concert mode. The following table represents various scenarios for updating the symbol and schematic of the die abstract.
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Fabric
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Type of Mismatch
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Resolution
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Non-IC Fabric
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More IO pads on the die abstract compared to the die layout
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-
LVA fixer deletes IO pads from the die abstract but it updates the die abstract’s symbol based on the following conditions only:
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If the IO pad is connected to a net that has multiple IO pads/pins, for example, VDD has three IO pads where one is deleted and two remain, no update is needed in the die abstract’s symbol. The reason being that the symbol has only one VDD irrespective of the number of IO pads of VDD that exist in the die abstract.
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If the IO pad is connected to a net that has only one IO pad/pin, for example, pin A has one IO pad that is being deleted, the die abstract’s symbol needs to be updated.
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Less IO pads on the die abstract compared to the die layout
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LVA fixer adds IO pads to the die abstract and updates the die abstract’s schematic and symbol.
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IC Fabric
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More IO pads on the die layout compared to the die abstract
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-
LVA fixer deletes IO pads from the die layout.
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The LVA fixer issues a message indicating that the die layout is not in sync with the die layout’s schematic or symbol.
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Less IO pads on the die layout compared to the die abstract
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-
LVA fixer adds IO pads in the die layout.
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The LVA fixer issues a message indicating that the die layout is not in sync with the die abstract’s schematic or symbol.
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