题目内容
A NOR gate can have two or more inputs. The dot 'o' on the output means 'not' showing that it is a Not OR gate. The output of a NOR gate is true when none of its inputs are true.
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The Flip-flop is the basic storage element in sequential logic ( in contrast to combinational logic ) .
The truth table shown summarizes the operations of the positive edge-triggered D flip-flop. On the rising edge of the clock signal, if the block is enabled, the output Q is the same as the input D.
A counter can be implemented quite easily using register-type circuits such as the flip-flop.
The 4-bit binary synchronous counter. counts upwards starting from ‘0000’ until it reaches an output ‘1111’ on each rising edge of the input clock signal .
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