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GATE AND SELECTION SYSTEM
•
The gate and selection system directs drive current to a
single X-line and a single Y-line.
•
The gate and selection logic consists of control drivers,
address decoders, and gates.
The purpose of the gate and selection
system is to direct drive current from a
current source to a single X-line and a
single Y-line.
The gate and selection
system acts like a switch at each end of
the drive lines to direct the current
source drive current to a single drive line
(Figure 2-75).
Thus, the current source
supplies the current, and the gate and
2-74
selection circuitry simply directs the cur-
rent to the appropriate drive line.
The gate and selection circuitry con-
sists of control drivers (SI5EX), address
decoders (US3AD), and gates (SI5ES, SI5ET).
In Figure 2-76, the composite logic is
shown for the Y-direction.
Notice that
the gates are turned on to direct the cur-
rent source to the appropriate drive line.
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