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Set-Reset Introduction
The Set-Reset latch (SR-latch) is composed of 2 NOR gates that feed their output back into the one of the others inputs. The NOR gated are said to be cross-coupled. See the picture to the left.
It's Beautiful on the Outside..
The SR latch seems perfect at first glance; however, the set-reset latch has a one fatal flaw: an unpredictable state. Most likely, if you try to think about the design for too long you will end up with a headache because the resulting Q and Q' during R=1 S=1 are opposite, and unpredictable.
As a result of that problem more complex designs for the latch were designed, such as the Set-Reset Gate that includes a clock in its design. A clock determines when input can be processed.
As a result of that problem more complex designs for the latch were designed, such as the Set-Reset Gate that includes a clock in its design. A clock determines when input can be processed.
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