EN Enable - Identifies an input that enables outputs, and
indicates which outputs are affected by it. Acts as a
connect switch when active, and a disconnect switch
when inactive.
G Gate (AND) - Identifies an input having an AND
relationship with other inputs or outputs having the
same identifier number (or symbol).
M Mode - Identifies an input that selects the mode of
operation, and indicates which inputs and outputs
depend on that mode.
N Negate - Identifies an input that when active,
complements other inputs or outputs, and identifies
which inputs and outputs are affected.
R Reset - When active, causes a flip-flop to reset.
S Set - When active, causes a flip-flop to reset.
V OR - Identifies an input having an OR relationship with
other inputs or outputs having the same identifier
number (or symbol).
X Transmission - Identifies an input that makes or
breaks bidirectional connections between affected
input/output ports.
Z Interconnection - Identifies a point that is internally
connected to another input, output, internal input, or
internal output having the same identifier number (or
symbol).
Miscellaneous Terms and Symbols. Figure A-10 shows
miscellaneous terms and symbols that are used in
conjunction with the logic symbols, function tables, and
truth tables used in this section.
A-6
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