October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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195Problem Formulation and Design of the Combinational Circuits
TABLE 9.1 Truth Table for the combina-
tional logic circuits with two inputs A and B and
two outputs X and X ’
Inputs Outputs
)*::
0001
0110
1010
1101
FIGURE 9.2 (a) A combinational circuit implementation by using four NANDs for outputs X and X ’ for the conditions com-
pletely specified by Table 9.1 (b) Corresponding combinational circuit implementation by using AND-OR gates after defining the
SOP Boolean expression.
Table 9.1). An XOR with one input always = 0 works as a BUFFER circuit for the other
input (refer Table 9.1).
9.2 PROBLEM FORMULATION IN A COMBINATIONAL CIRCUIT
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