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Method for Long Wire Tapering for Timing-Driven Routing Congestion Reduction

IP.com Disclosure Number: IPCOM000246185D
Publication Date: 2016-May-13
Document File: 2 page(s) / 239K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is an efficient method for routing long wires on low resistance metal layers. The low resistance metal layers have large pitches and therefore number of tracks on the layers are very limited.

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This is the abbreviated version, containing approximately 100% of the total text.

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Method for Long Wire Tapering for Timing-Driven Routing Congestion Reduction

Disclosed is an efficient method for routing long wires on low resistance metal layers. The low resistance metal layers have large pitches and therefore number of tracks on the layers are very limited.

In accordance with the method, it is illustrated that a properly routed net, need not be routed in its entirety in critical, high quality layers. Some large percentage of the net may be routed in a lower, more highly resistive layers, at a minimal degradation in performance, but at a substantial reduction in the use of the high quality layer. The method reduces demand for high quality routing layers, thus controlling high quality layer congestion with a minimal timing tradeoff.

The method uses lower resistance (thick) layer at near end of performance critical nets and drops down to higher resistance (thinner) layer for far end of nets. Fig. 1 and Fig. 2 illustrate the routing.

Fig. 1

1


Page 02 of 2

Fig. 2

The routing provides performance that is comparable to net routed entirely on thicker layer, but the utilization of thicker layer is cut significantly. Therefore, the method permits up to twice as many high performance routes.

2