题目内容
Comparing with an analog signal assuming a continuous range of values, a digital signal assumes discrete values, usually two permitted value.
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Computers are constructed of digital building blocks such as logic gates, flip-flops and counters.
The output of XOR is 1 if one input is 1 and the other is 1.
The NAND, NOR and XOR are sequential logic, while the D flip-flop and JK flip-flop are combinational logic.
A binary 4-bit synchronous is implemented using 4 JK flip-flop and 2 AND gates.
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