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This is an improved chip wiring technique requiring less global wiring and introducing fewer global blockages.
English (United States)
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Optimized Chip Cell Organization
This is an improved chip wiring technique requiring less global wiring and
introducing fewer global blockages.
The optimized chip cell organization allows connections to be made between
cells in both the horizontal and vertical directions. These connections are made
with book metal. By book metal is meant cell wiring personalization including
power distribution. There can be no total blockages introduced by power bus
schemes on first-level metal.
Typically illustrated in the figure is the chip cell boundary with its active
component area and the global wiring channels. This cell is then stepped to form
a row of back-to-back active component regions. The active component is simply
represented by a logic block with a fan-in of two and a fan-out of one.
Connections are made between components using book metal in the back-to-
back region. These connections require less space than previously used global
connection approaches, and in turn introduce fewer global blockages and less
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