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Theory and Schematics--Moaef
5h553A
Tab1e
8-2.
Logic
Symbols
All
signals
flow from left to right,
relative
to
the
symbol's orientation with
inputs on
the
left side of the symboi,
and
outputs on the right
side
of
the
symbol
(the
symbol
may be
r."r"rrud
if
the dependency
notation
is a
single
term.)
All dependency notation is
read
from left to right (relative to
the symbol,s orientation).
An
externar
state
is
the
state
of
an input or output outside the
rogic symbor.
An internal state
is the state
of
an input or output
inside
the logic symbol.
All
internal
states are
True
:
High.
SYMBOL CONSTRUCTION
some
symbols consist
of
an
outline
or
combination
of
outlines together with
one or
more
quallfying
symbols,
and
the
representation
of
input
and
output
lines.
GENERAL
Some have a
common
Control Block with
an
array
of
elements:
CHIP
FUNCTION
FOUTPUTS
CONTROL
BLOCK
COMMON
OUTPUT
DEPENDENCY
NOTATION
LEAST
SIGNIFICANT
ELEMENT
)*
ourpurs
sstr+i"J.*l
rNPUrs
t
ARRAY
ELEMENTS
,NPUrs
*{
MOST
SIGNIFICANT
ELEIUENT
coNTRoL BLocK
-
All
inputs
and
dependency notation
affect the array elements
directly.
Common
outputs
are
located in the
control block. (Control blocks
may be above
or below
the array elements.)
ARRAY ELEMENTS
-All
array elements
are
controlled
by
the
control
block
as
a
function
of the
dependency notation.
Any
array element
is
independent
of all
other
array
elements.
Unless
indicated,
the least signif
icant element
is
always
closest to the
control
block.
The
array elements
are
arranged
by
binary weight.
The
weights
are
indicated
by
powers
of
2
(shown in
[
]).
CTR
DIV
16
M1
M2
(:J
G4
3,5CT=1S
G5
4,5cr=
o
G6
2,3,5,6+
/1,C7
2.4.5,6-/1.C7
8-11
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