Download An Artificial Intelligence Approach to VLSI Routing by R. Joobbani PDF

By R. Joobbani

ISBN-10: 1461296064

ISBN-13: 9781461296065

ISBN-10: 1461325552

ISBN-13: 9781461325550

Routing of VLSI chips is a vital, time eating, and hard challenge. the trouble of the matter is attributed to the big variety of usually conflicting elements that have an effect on the routing caliber. conventional concepts have approached routing by means of ignoring a few of these components and enforcing pointless constraints with the intention to make routing tractable. as well as the imposition of those regulations, which simplify the issues to a point yet whilst decrease the routing caliber, conventional ways use brute strength. they generally remodel the matter into mathematical or graph difficulties and fully forget about the categorical wisdom in regards to the routing activity which can vastly support the answer. This thesis overcomes a number of the above difficulties and provides a method that plays routing on the subject of what human designers do. In different phrases it seriously capitalizes at the wisdom of human services during this region, it doesn't impose pointless constraints, it considers all of the various factors that have an effect on the routing caliber, and most significantly it permits consistent consumer interplay during the routing method. to accomplish the above, this thesis offers historical past approximately a few consultant thoughts for routing and summarizes their features. It then reviews intimately different elements (such as minimal sector, variety of vias, twine size, etc.) that have an effect on the routing caliber, and the several standards (such as vertical/horizontal constraint graph, merging, minimum rectilinear Steiner tree, etc.) that may be used to optimize those factors.

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Additional info for An Artificial Intelligence Approach to VLSI Routing

Sample text

It increases the routing area. Figures 2·15(a) and 2·15(b) show the case when this constraint is imposed or relaxed respectively. As it is obvious Figure 2·15(b) uses one less row than the one in Figure 2·15(a). 18 15 4 0 I? 7 LI (J (i l. o 15 14 •• 1- ••••••••••••• 13 •• 1-' •••••••••••• 1'J ...... :~ J .. 1- •••••••• ••••• 1- •••••••••••••••••••••• .. ~ ...... l ..... 1 18 0 ••••• Ifi 3 19 0 --r 20 18 20 •• •• •• •• •• r- • . 17 4 7. 24 ••••• t- ................... 16 1 • •• •• •• 9 12 ;'0 •• •• •• •• r •••••••••• 14 24 Z1 (J .

This is mainly because it is not directly helpful, but WEAVER uses the technique to find what is the best possible pattern to route a net. The initial routing pattern guides WEAVER through the search space to reduce the amount of search and to drastically improve the routing quality. In this section the Rectilinear Steiner Tree (RST) is studied in more detail and two algorithms are presented. One algorithm is for finding the RST for a channel (a 2xn grid) and the second algorithm is applicable to switch-boxes (a mxn grid).

The OPS5 form of the rule starts with '(p' which signals the start of a production (rule), followed by 'remove-pins-of-a-routed-net' which is the name of the production followed by three conditions. The first condition '(context tobjective house- keeping tstatus active)' is satisfied if the program is in the house-keeping context. The second condition '(net tnet-name tnet-is-routed yes)' is satisfied if there is a working memory element of class net which is routed. The third condition '(pin tnet-name

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