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In: Electrical Engineering

4. Bit sequence recognizer [30] Submission file for this part: 4.circ Main circuit name: sequencecheck Input...

4. Bit sequence recognizer [30]

  • Submission file for this part: 4.circ
  • Main circuit name: sequencecheck
  • Input pin(s): inputx [1], sysclock [1]
  • Output pin(s): outputr [1]

Derive a minimal state table for a Mealy model FSM that acts as a sequence checker. During four consecutive clock cycles, a sequence of four values of the signal x is applied, forming a binary number. The oldest value of x would become the most significant bit in that binary number. The most recent value of x would become the least significant bit.

The FSM will output outputr = 1 when it detects that the previous 4 bit sequence was either 0100 or 1010. At all other times, including when the previous sequence was not those described previously, outputr = 0. Implement the FSM as a circuit in Logisim Evolution.

Note that much like the last problem, this is not a sliding window. After the fourth clock pulse, the circuit resets itself and is ready to take in the next 4 bit sequence.

You will lose a significant portion of credit if your FSM is not minimized.

You will lose a significant portion of credit if your combinational logic is not minimized. If you violate both this and the previous constraint, you will get a 0

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