SERVICE MODEL 8559A
SYMBOLS USED IN SCHEMATIC AND BLOCK DIAGRAMS
BASIC
LOGIC SYMBOLS
Indicator Symbols (positive logic assumed)
R
EDGE
-
TRIGGERED (dynamic) inputs
are indicated by the presence of the
dynamic input symbol.
Input
is
active only on the positive
-
going
transition.
ACTIVE PERIOD
'L
Input is active only on the negative-
going transition.
ACTIVE PERIOD
ACTIVE
-
HIGH inputs and outputs are
indicated by the absence of the negation
symbol,
0.
ACTIVE PERIOD
ACTIVE
-
LOW inputs and oututs are in
-
dicated by the presence of the negation
symbol,
0.
ACTIVE PERIOD
FIGURE
8-1.
SYMBOLS USED IN SCHEMATIC AND BLOCK DIAGRAMS
(4
OF
4)
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