The Ratsnest view displays net connectivity between assigned logic macros by connecting lines from the output pins to all input pins. Use the Ratsnest to understand how logic macros are connected to each other. The Ratsnest view is activated by default, showing all input and output nets for the selected macro.
To display the Ratsnest view:
From the Nets menu, choose Display, and then choose Input, Output, or Both, depending on which type of nets you want to display.
From the Nets menu, choose Display Algorithm, and then choose Ratsnest, or click the Ratsnest button in the toolbar.
Select the assigned macro in the ChipView window or Assigned list box. ChipEditor displays all nets connected to the assigned macro. To see nets assigned to multiple macros, hold down the CTRL key while you click on each assigned macro.