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This article describes a technique which allows a user to find the best rearrangement of existing wires on a logic card to enable an overflow wire to be embedded.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
80% of the total text.
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Logic Card Wire-Embedding Technique
This article describes a technique which allows a user to find the best
rearrangement of existing wires on a logic card to enable an overflow wire to be
The final stage in the design automation process for a logic card is to
manually embed any 'overflow' wires which could not be routed automatically by
earlier steps in the Design Automation process. This is done by providing the
user with a Visual Display Unit image of the logic card and a means by which he
can re-route existing wires in order to provide the required paths for overflow
wires to be embedded.
However, with multilayer cards and boards in which unused matrix holes may
be used as feedthroughs (vias), it is extremely difficult for the user to determine
what action needs to be taken in order to embed an overflow wire. A great
improvement in the efficiency of the process can be achieved with the following
At user request, the computer system operates on the logic card image. One
recognizable character (e.g., 'A') is placed in all card locations that can be
reached from one end of the overflow wire, and a different character (e.g., 'B') is
placed at all card locations that can be reached from the other end of the
overflow wire. This is done using the standard "Lee's algorithm" for one wiring
plane: whenever the operation reaches a possible via, the algorithm is continued
on all other wiring planes connected to that Via. Eventually, no further advanc...