Browse Prior Art Database

Use of Relatively Diagonal and Rectangular Wiring Planes in Multilayer Packages

IP.com Disclosure Number: IPCOM000075494D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Layden, EC: AUTHOR

Abstract

A multilayer board is formed by laminating plane pair subassemblies containing alternate layers of exclusively rectangular and exclusively diagonal" wiring. Shortest path connections are routed through the plane pairs by connections of the wiring to interstitial vias and multilayer through-connectors (logic pins). The "rectangular" wiring orientations are parallel to the perpendicular edges of the board, and the diagonal directions are oriented at 45 Degrees to the rectangular.

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Use of Relatively Diagonal and Rectangular Wiring Planes in Multilayer Packages

A multilayer board is formed by laminating plane pair subassemblies containing alternate layers of exclusively rectangular and exclusively diagonal" wiring. Shortest path connections are routed through the plane pairs by connections of the wiring to interstitial vias and multilayer through-connectors (logic pins). The "rectangular" wiring orientations are parallel to the perpendicular edges of the board, and the diagonal directions are oriented at 45 Degrees to the rectangular.

The rectangular plane pair in Fig. 1 accommodates up to three wiring lines in the channel spaces 1, 2 between potential sites of logic pins and vias. The associated diagonal plane pair (Fig. 2) accommodates at most two wiring lines per diagonal channel space 3, 4. However, the rectangular pair configuration contains four channels per plane, whereas the diagonal configuration contains seven channels. Furthermore, the rectangular configuration has five units of wiring length per channel (a unit of this sort being the distance between adjacent pin-via sites), or a total of 5 x 4 x 3 x 2 = 120 potential line units per plane pair, while the diagonal construction compares favorably with 3.5 units per channel (average) x 8 channels per plane x 2 lines per channel x 2 planes per pair = 112 potential line units.

Fig. 3 indicates that rectangular and diagonal wiring can be program selected by simple sort criteria; to wit...