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education/computer engineering/ECE2700/Sequential Circuits.md
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# Latches
## SR Latch
SR stands for *Set*/*Reset*, and functions like so:
- When a signal comes into $S$, $Q_a$ is **set** on and stays on until a signal comes into $R$, at which point $S$
- When a signal comes into $S$, $Q_a$ is **set** on and stays on until a signal comes into $R$, at which point the output ($Q_a$) is **reset**, back to zero.
- $S$ and $R$ are interchangeable, it just impacts whether $Q_a$ or $Q_b$ is set/reset.
Truth table:
| $S$ | $R$ | $Q_a$ | $Q_b$ |