Logic Symbol Legend
GENERAh
LOGIC INFORMATION
Voltage Switching Levels
+5.5
--
---
-
---
Up
Level
Region
+2.0
....,.------
Unreliable Region
+0.8 -
---
Down
Level
Region
Polarity
Polarity
is
indicated by a wedge ( t::...)
or
no wedge.
More negative
VOltage~
A I
More positive voltage
-----
Active Level
Active level
is
the
line level
that
conforms
to
the
edge-of-
block character for
that
line.
This line
is
active when
minus~
This line
is
active when
PIUS-U
Logic Symbols
Line Function
Symbol Description
S Sets a storage bit.
R Resets a storage
bit
or
register. I t can also
be
used
to
hold a logic block off.
J
5-4
Note: Multiple R lines can
be
present
in
a
logic block.
Anyone
line resets the logic
block and does
not
depend on
all
R lines
being active.
Sets a storage bit.
Line Function
Symbol
K
T
D
C
CD
SD
SU
SDD
SUD
+n
-n
G
n
A
R!W
R/B
Decimal
Numbers
Description
Resets a storage bit.
Note: Simultaneous application
of
J and K
',/
~!'1plemEm~
the
stored bit.
Complements a storage bit.
Data into a storage bit. Sets indicated
./\
polarity; resets opposite polarity.
'.,,-~
Control input
to
a polarity hold, storage
device,
or
register.
The control data line under control
of
the
Cline.
Shifts bits
in
register down one
bit
position.
Shifts bits
in
register up one bit position.
Simultaneously sets a data bit into a
register and shifts
all
the
other
bits
in
the
..
'.
register down one bit position.
./
Simultaneously sets a data bit into a
register and shifts
all
other
bits
in
the
register up one bit position.
Increases binary
count
in register by n
(any decimal number).
Decreases binary
count
in
register by n
(any decimal number).
Gate control.
Gated dependent line (for example,
Gl,
G2,G3).
Common read/write address
to
MREG.
Read/write control line
to
MREG.
/
Reset
output
buffer
to
MREGB.
Used
to
weight
DCD
(decoder) input and
output
lines.
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