This is the fourth in a series of videos about latches and flip-flops. These bi-stable combinations of logic gates form the basis of computer memory, counters, shift registers, and more. In particular, this video covers the clocked D latch, that is, a D latch controlled by a computer clock signal which is important for synchronisation. It shows how an edge detection device can be built from a NOT gate and an AND gate in order to isolate the rising edge of the clock cycle. It then shows how this can be u
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