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This is the 4-bit synchronous counter from the lecture slides. Its capable of counting from o (binary 0000) to 15 (binary 11
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The new states of B0,B1,B2 and B3 will be 0000 (B0=0, B1=0, B2=0 and B3=0). This is because when the count enable is 1, the inputs of j k flip flops are 1's (as the previous output of the flipflop is 1) and when the clock pulse goes high the output of the flip-flops will get toggle so that it goes from 1 to 0.

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