Improved pad ring router

Details Improved pad ring router Improved pad ring router

1992-02-28

1994-12-27

Black, Thomas G.

Boots, shoes, and leggings

364488, 364489, 364490, G06F 1560

Patent

active

053771257

ABSTRACT:
A method sizes routing channels used to route pads to a logic core. Six channels are defined. The six channels include a first special channel, a second special channel, a left channel, a right channel, a bottom channel and a top channel. The first special channel is immediately below the logic core and within a span of the logic core. The second special channel is immediately above the logic core and within a span of the logic core. The left channel is adjacent to a left side of the logic core, the first special channel and the second special channel. The right channel is adjacent to a right side of the logic core, the first special channel and the second special channel. The bottom channel is adjacent to a bottom side of the left channel, the first special channel and the right channel. The top channel is adjacent to a top side of the left channel, the first special channel and the right channel. Pads are positioned at a top side of the top channel, at a bottom side of the bottom channel, at a left side of the left channel and at a right side of the right channel. After performing a global route through the six channels, the six channels are re-sized based on channel density resulting from channel routing each of the six channels. The re-sizing includes repositioning the pads.

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Charles H. Ng, "An Industrial World Channel Router For Non-Rectangular Channels", 23rd Design Automation Conference, 1986, pp. 490-494.
D. Hsu, L. Grate, C. Ng, M. Hartoog, and D. Bohm, "The Chip Compiler, An Automated Standard Cell/Macrocell Physical Design Tool", Custom Integrated Circuits Conference, 1987, pp. 488-491.
Howard H. Chen, "Routing L-Shaped Channels in Nonslicing-Structure Placement", 24th ACM/IEEE Design Automation Conference, 1987, paper 8.3, pp. 152-158.

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