Over-the-cell channel routing for high performance circuits

The authors present a new three-layer over-the-cell channel routing algorithm, WILMA3 (wire length minimization algorithm 3), for high-performance circuits. This router not only minimizes the channel height by OTC routing but also minimizes the net lengths. They have also developed a two-layer router, WILMA2. Both WILMA2 and WILMA3 achieve reduction in channel height while maintaining the net length greater than its length in the two-layer channel routing. Experimental results with WILMA2 indicated that WILMA2 can produce routings that are comparable to existing two-layer over-the-cell routers. Both WILMA2 and WILMA3 achieved these results, while maintaining the net length bound