Browse Prior Art Database

Automatic Placement Technique Using Blockage Measurement

IP.com Disclosure Number: IPCOM000094784D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 17K

Publishing Venue

IBM

Related People

Dunham, B: AUTHOR [+2]

Abstract

In printed circuit boards, a common requirement is that two pins of plug-in components must be connected on the same wiring surface by lines printed on the surface extending in bi-directional channels, so that the connection consists of a line forming two adjacent sides of a rectangle. Any given circuit board includes a plurality of such connections.

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Automatic Placement Technique Using Blockage Measurement

In printed circuit boards, a common requirement is that two pins of plug-in components must be connected on the same wiring surface by lines printed on the surface extending in bi-directional channels, so that the connection consists of a line forming two adjacent sides of a rectangle. Any given circuit board includes a plurality of such connections.

In the automatic design of such printed circuit boards, it is desirable to place and connect the components in the most efficient manner, that is, to interconnect the maximum number of components with a relatively minimal length of wiring lines, with relatively minimal wiring line interference. To determine efficiency, a method of determining a figure of merit for given connections must be established.

A method of wiring and determining the figure of merit which applies in a large percentage of cases is to choose a placement of components on the board which topologically distorts the necessary lines into long and short legs. Such a placement also partially solves the initial question of wiring the board, that is, which connections are to be made on which wiring surface and those connections whose long legs are parallel go on one surface. The short legs are then blocking lines, i. e., they are going against the general flow of traffic and interfere with other lines in that flow. This interference, or blockage, must be minimized. To do this, the appropriate figur...