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.



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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