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Service
Model
8901B
mble 8A-6. Schematic Diagram Notes
(11
of
11)
L
The input that controls or gates other inputs is labeled with a
C
or a G,
followed by an identifying number.
The controlled or gated input or output is labeled with the same number.
In this example, 1 is controlled by G1.
OR
When a V input is active, the output will be in its active state. With the
V input inactive, the device functions as if the V input doesn't exist.
ENABLE
EN
TRANSMISSION
-
CONTROL
ADDRESS
A0
SIi
G A
When the EN input is active, the output is enabled to function normally.
When the EN input is inactive, the three-state output
( V
), in this case,
becomes a high impedance, effectively removing that device from the
circuit.
When the X1 input is active, the associated input-output pair are bi-
directionally connected together. When X1 is inactive, the connection is
broken.
When the controlled or gated input or output already has
a
functional
label (D is used here), that label will be prefixed by the identifying
number.
If the input or output is affected by more than one gate or control input,
then the identifying numbers of each gate or control input will appear
separated by commas.
When GA is active, the active address line (0 through 3) is the decoded
value of the 1 and 2 binary inputs. When the controlled address lines
have a functional value, that value will be prefixed by the identifying
letter.
8A-20
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