Syco small business routers
The channel routing problem is a special care of the wire routing problem when interconnections have to be performed within a rectangular strip having no obstructions, between terminals located on opposite sides of the rectangle. In addition, the router has routed difficult channels such as Deutsch's in density and has performed better than or as well as YACR-II on all the channels available to us.
In particular, Burstein's difficult switchbox example has been routed using one less column than the original data. Many test cases have been run, and on all the examples known in the literature the router has performed as well as or better than existing algorithms. The algorithm has been implemented in the "C" programming language. The algorithm has been rigorously proven to complete in finite time and its complexity has been analyzed. The rip-up and reroute steps (called strong modifiction) remove segments of nets already routed to make room for a blocked connection these steps are invoked only if weak modification fails. The modification steps (also called weak modification) relocate some segments of nets already routed to find a shorter path or to make room for a blocked net. The technique is based on an algorithm that routes the nets in the routing region incrementally and intelligently, and allows modifications and rip-up of nets when an existing shortest path is "far" from optimal or when no path exists. boundaries can be described by any rectilinear edges, the pins can be on or inside the boundaries of the region, and the obstructions can be of any shape and size. The routing regions that can be handled are very general: the. In this paper, a new routing technique that can be applied for general two-layer detailed routing problems, including switchboxes, channels, and partially routed areas, is presented.
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Our algorithm subsumes the heuristics proposed by (2) as special cases of a more uniform framework, and supercedes them in that we show cases that can be handled by dominators and not by partitioning into fanout free regions alone.įor the macrocell design style and for routing problems in which the routing regions are irregular, two-dimensional routers are often necessary. Our major result is that dominators coupled with efficient priority queues provide a very clean as well as efficient framework for minimizing the effort involved in single fault propagation. We developed algorithms both for the special case of a single test vector, and for the general case which is useful when fault dropping is relevant. We then show how the use of dominators in directed graphs (11) (6) can speed up single fault propagation algorithms for fault simulation. We give an efficient event driven single fault propagation algorithm which uses a priority queue. In this paper we propose the use of efficient data structures and graph algorithms to improve the efficiency of single fault propagation. One of the most efficient schemes for performing fault simulation is propagating the effect of single stuck-at faults one at a time (9), hence the term single fault propagation. REFERENCESįault simulation is the problem of finding all single stuck at faults in a circuit which are detected by a given input set of test vectors.
In addition, the router has routed difficult channels such as Deutsch's in density and has performed better than or as well as YACR-II in all the channels available to us. In particular, the Burstein's difficult switch box example has been routed using one less column than the original data. Many test cases have been run and on all the examples known in the literature the router has performed as well or better than existing algorithms. The algorithm is rigorously proven to complete in finite time and its complexity is analyzed. The rip-up and re-route steps (called strong modification), remove segments of nets already routed to make room for a blocked connection and is invoked only if weak modification fails. The modification steps (also called weak modification) push some segments of nets already routed to make room for a blocked net. The technique is based on an algorithm that routes incrementally and intelligently the nets in the routing region and allows modifications and rip-up of nets that may impede the complete routing of other nets. The routing regions that can be handled are very general: the boundaries can be described by any rectilinear chains and the pins can be on the boundaries of the region or inside it, the obstructions can be of any shape and size. In this paper a new routing technique that can be applied for general two-layer detailed routing problems including switch boxes, channels and partially routed areas, is presented. For the macro-cell design style and for routing problems where the routing regions are irregular, two dimensional routers are often necessary.