
2.1. THE DESIGN OF A 4-BIT MULTIPLIER USING ADDER TREES 71
We are now ready to take our design into the layout phase in the design process. We use first OCP to place it.
% ocp -ring multiplier4 mymultiplier4
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Placer for Standards Cells
Alliance CAD System 5.0 20040928, ocp 5.0
Copyright (c) 2001-2005, ASIM/LIP6/UPMC
o Special Net detected : vdd
o Special Net detected : vss
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Ocp : placement finished
With the circuit in place now we route it with NERO.
% nero -V -2 -p mymultiplier4 multip lier 4 multiplier4
At this point it is useful to check the design flow we have followed. This is displayed in Figure 2.8. As could
Figure 2.8: Design flow in a hierarchical design up to the placement step.
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