Currently the router can use FAN[0-7] and BYP[0-7] nodes in a way that generates antennee nets. In particular, if the FAN[0-7] and BYP[0-7] connect to a site pin, that node should only be used if the router is visiting the site pin. Current the router thinks the connections between the FAN/BYP routing node to the IPIN is configurable, but this is not the case.
Solution is unclear, but likely involves making the FAN/BYP into IPIN nodes, and collapsing the nodes in between.
Because FAN_ALT -> FAN -> IPIN are non-configurable, update these VPR switchs to be buffering /non-configurable
Add a pass after net terminals are assigned to set the occupancy of all unused IPINs (and their associated non-configurable sets) to 1. This will force the router to avoid these rr nodes.
Currently the router can use FAN[0-7] and BYP[0-7] nodes in a way that generates antennee nets. In particular, if the FAN[0-7] and BYP[0-7] connect to a site pin, that node should only be used if the router is visiting the site pin. Current the router thinks the connections between the FAN/BYP routing node to the IPIN is configurable, but this is not the case.
Solution is unclear, but likely involves making the FAN/BYP into IPIN nodes, and collapsing the nodes in between.