Product Documentation
Virtuoso MultiTech Framework User Guide
Product Version IC23.1, November 2023

IO Pad Connectivity Mismatch Fixes

The LVA fixer addresses the connectivity mismatches that the LVA checker reports for the die abstract, and propagates the changes to the corresponding symbol and schematic views of the die abstract. Therefore, the connectivity in all associated views are synchronized.

Fabric Type of Mismatch Resolution

Non-IC Fabric

The die layout view in the background is the golden view.

IO pads have connectivity in the die layout, but have no connectivity (unconnected IO pads) in the die abstract

The LVA fixer refers to the bump connectivity information in the die layout and establishes similar connectivity in the die abstract. It also propagates the changes to the corresponding die abstract’s symbol and schematic views.

If the IO pad is connected to a net that has multiple IO pads/pins, for example, VDD has three IO pads where the connectivity of any bump is changed to VDD, no update is needed in die abstract’s symbol because the symbol has only one VDD irrespective of the fact that how many IO pads of VDD exist in the die abstract.
If the IO pad is connected to a net that has no existing IO pads in the die abstract, for example, if the IO pad connectivity is changed to pin A that has no existing IO pads, the die abstract’s symbol needs to be updated.

IO pads have connectivity in the die abstract, but have no connectivity (unconnected IO pads) in the die layout

The LVA fixer removes connectivity from the IO pads in the die abstract. It also propagates the changes to the corresponding die abstract’s symbol and schematic views.

IO pads with different connectivities in the die layout and the die abstract

The LVA fixer establishes connectivity in the die abstract as per the die layout and propagates the changes to the corresponding die abstract’s symbol and schematic views.

IC Fabric

The package view in the background is the golden view.

IO pads with different connectivities in the die layout and the die abstract
  • The LVA fixer establishes connectivity in the die layout as per the die abstract.
  • Else, the LVA fixer issues a message indicating that the die layout is not in sync with the die abstract’s schematic or symbol .

Related Topics

Edit-in-Concert

Modify in Edit-in-Concert Mode

Running the LVA Checker

Running the LVA Fixer

IO Pad Number Mismatch Fixes


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