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Digital Arithmetic
book

Digital Arithmetic

by Miloš D. Ercegovac, Tomás Lang
September 2003
Intermediate to advanced content levelIntermediate to advanced
709 pages
26h 51m
English
Morgan Kaufmann
Content preview from Digital Arithmetic
76 e ~ A pT E R 2 Two-Operand Addition
Now we define a section ofp groups and determine with a CLG the carry-out
of each group in the section. That is,
c ~1) = Go +
Aoco
C (2) =
G1 + A1Go + A1Aoco
,,.
c (t') -- GI,_I + At,-1Gp-z + "'" + (Ap-iAp-2"-" Ao)co
2.47
Once the carries out of the groups are produced, these carries are used by the
first-level CLA modules to produce the bit carries and the sums. Figure 2.15
shows a 32-bit adder with two-level lookahead (with p = m = 4).
Note that the CLA module is used twice: first to compute A and G (which are
independent of the carry-in to the group) and then, ...
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Publisher Resources

ISBN: 9781558607989