If you are just looking for a counter that can drive a pair of 7-seg displays, there are various approaches. (1) use 14 FFs and transition from one state to another using standard state-table/k-map methods. You can handle blanking, too, this way. No 7-seg decoder required. (2) set up a 5 FF binary counter, state table/k-maps, use double dabble to convert to BCD, then use 7-seg BCD decoders for the display. (3) set up 7 FFs as BCD counters, use state tables/k-maps, and 7-seg BCD decoders. Many paths. Do all three for extra points! ;)
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