
2.1. THE DESIGN OF A 4-BIT MULTIPLIER USING ADDER TREES 73
We are now ready to convert our symbolic design to a real one (using the technology provided by Alliance).
For this, we use S2R.
% s2r multiplier4
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Symbolic to Real layout converter
Alliance CAD System 5.0 20040928, s2r 5.0
Copyright (c) 2002-2005, ASIM/LIP6/UPMC
o loading technology file : /usr/local/alliance/etc/cmos.rds
o loading all level of symbolic layou t : multiplier4
o removing symbolic data structure
o layout post-treating
with top connectors,
with sub connectors,
with signal names,
without scotch.
o saving multiplier4.cif
We can visualize the layout obtained using DREAL.
% dreal
The layout obtained with S2R is shown in Figure 2.9. The other two trees shown in Figure 2.3 can be
Figure 2.9: Layout shown by DREAL.
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