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发表于 2010-11-16 13:57:46
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1.it is visually check the congestion statistics. by trial route generate congestion.
Eg: V=44/40 H=16/18
The vertical(V) overflow is 44/40 (44 tracks are required, but only 40 tracks are available)
The Horizontal(H) overflow is 16/18 (16 tracks are required, and 18 tracks are available)
2. fix it as following step:
I. Can adjust block placements and/or orientations to make sure that connecting pins also face each other.
II.Can use a partial placement blockage to lower the congestion in a specific area.
III.Read the log file for horizontal and vertical overflow numbers(%), where 1.0% is the limit for 5+ metal layers and 0.5% is the limit for 3 layers. These are optimal limits for proceeding to detail routing. |
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