AR# 42348: 13.2 PlanAhead - When using Show Connectivity feature, high fanout nets will be limited in number of connections shown
13.2 PlanAhead - When using Show Connectivity feature, high fanout nets will be limited in number of connections shown
Selecting primitive cells within PlanAhead and then selecting the "Show Connectivity" feature will not necessarily show all connection to and from that cell. This is due to a limit on the number of connections permitted for display within PlanAhead. This is most likely as high fanout nets will make it difficult to view the connectivity, e.g. clk and rst signal on FFs.
To work around the limitation, go to the schematic view (as opposed to the device view in PlanAhead tool) and select the individual pin/nets from the cell you wish to get the complete connectivity for, and then to view this result go back to the device view.
In 13.3, an option has been added to allow the user to set the connectivity limit.
The option is available under Tools -> Options -> General settings.