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Help me with logic circuit design of up-down synchronous counter

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Lance1314

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Figure 1 shows a simple block diagram of an up-down synchronous counter. When the switch is ON, the counter will count in the sequence given ( 11, 12, 13, 14, 15 ). The sequence is to be displayed on two seven-segment displays. When the reset button is pressed, the counter will reset to 00. When the switch is OFF, the counter will count in the reverse sequence.

Logic Circuit.png

1. Design a logic circuit that meets the design specifications above.
2. The logic circuit includes 2 seven-segment decoders.

Anyone please show me your design steps. Thanks a lot for your help.
 

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