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A circuit which includes a DC powered storage element can be used to make an S/R flip-flop with reset-override. The advantage of the override feature is that it leads to a simple data latch.
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Reset Override Latch For Current Injection Logic and DC Cross-Coupled
A circuit which includes a DC powered storage element can be used to make
an S/R flip-flop with reset-override. The advantage of the override feature is that
it leads to a simple data latch.
The circuit 1 is shown in Fig. 1. The AC powered logic is a CIL (Current
Injection Logic) AND gate 2 consisting of two interferometers and an injection
device. The circled ouput 3 is the function (p.q + (q.p), which is readily available
from AND gate 2. The DC powered flip-flop 4 must be of the cross-coupled type,
not a ring-cell. The ring-cell flip-flop cannot tolerate overlapping S and R signals,
while cross-coupled flip-flops can. Cross-coupled flip-flops ultimately respond to
the last "high" signal, and therefore they can tolerate overlapping inputs that do
not turn off simultaneously.
If a logic cycle starts with a "0" stored in flip-flop 4 and R is applied to OR
gate 5 during the cycle, signals will appear in sequence at Q, S', T and P. P
appears at the output of OR gate 6 after being triggered by an input from T via
line 7. With P and Q now both present at the input of gate 3, the "1" at S' is
transferred to R' (leaving "0" at S'), causing flip-flop 4 to reset.
If S had been applied instead of R, the signal at P would generate a "1" at S',
setting flip-flop 4. The feedback via line 7 from T now has no effect since OR
gate 6 is already latched.
If S appears during a cycle when flip-flop 4 co...