Repeater block planning under simultaneous delay and transition time constraints

We present a solution to the problem of repeater block planning under both delay and signal transition time constraints for a given floorplan. Previous approaches have considered only meeting the target delay of a net. However it has been observed that the repeater planning for meeting the delay target can cause signals on long interconnects to have very slow transition rates. Experimental results show that our new approach satisfies both timing constraints for an average of 79% of all global nets for six MCNC benchmark floorplans studied (at 1 GHz frequency), compared with an average of 22% for the repeater block planner reported previously