Placement of a Large Integrated Circuit, Spacers and Heat Map of Resource Allocation (image) National Science Foundation Share Print E-Mail Caption The image on the right shows the physical placement of a large integrated circuit with logic gates in blue and 'packing peanuts' (spacers) in red. The 'heat maps' on the left show wiring congestion -- green and yellow show sparse connectivity, but red and purple show insufficient routing resources. Routing congestion is one of the manifestations of physical limits to computation. The progression of images illustrates how computer-aided design tools address routing congestion by revising circuit placement. Credit Myung-Chul Kim, Jin Hu, Igor L. Markov (University of Michigan) Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.