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A sequential circuit has an input (X) and two outputs (S and V). X represents a4-bit binary number N which is input least significant bit first. S represents a 4-bitbinary number equal to N +2, which is output least significant bit first. At the timethe fourth input occurs, V-1 if N +2 is too large to be represented by four bits;otherwise, V = O. The value of S should be the proper value, not a don't care, in both cases. The circuitalways resets after the fourth bit of X is received. The Mealy state graph is shown belovwNext StateSV00 1010 0000 1000 1010 0010 01KoMeaningNo bits receivedS One bit receivedS, Two bits received, Carry-in-0S, Two bits received, Carry-in-1Three bits received; Carry-in-0S Three bits received, Carry-in -1Write a behavioral Velog description of the state machine. Assume that state changes occur on the fallingedge of the clock pulse. Use a case statement together with if-then-else statements to represent the statetable

Question
A sequential circuit has an input (X) and two outputs (S and V). X represents a
4-bit binary number N which is input least significant bit first. S represents a 4-bit
binary number equal to N +2, which is output least significant bit first. At the time
the fourth input occurs, V-1 if N +2 is too large to be represented by four bits;
otherwise, V = O. The value of S should be the proper value, not a don't care, in both cases. The circuit
always resets after the fourth bit of X is received. The Mealy state graph is shown belovw
Next State
SV
00 10
10 00
00 10
00 10
10 00
10 01
Ko
Meaning
No bits received
S One bit received
S, Two bits received, Carry-in-0
S, Two bits received, Carry-in-1
Three bits received; Carry-in-0
S Three bits received, Carry-in -1
Write a behavioral Velog description of the state machine. Assume that state changes occur on the falling
edge of the clock pulse. Use a case statement together with if-then-else statements to represent the state
table
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A sequential circuit has an input (X) and two outputs (S and V). X represents a 4-bit binary number N which is input least significant bit first. S represents a 4-bit binary number equal to N +2, which is output least significant bit first. At the time the fourth input occurs, V-1 if N +2 is too large to be represented by four bits; otherwise, V = O. The value of S should be the proper value, not a don't care, in both cases. The circuit always resets after the fourth bit of X is received. The Mealy state graph is shown belovw Next State SV 00 10 10 00 00 10 00 10 10 00 10 01 Ko Meaning No bits received S One bit received S, Two bits received, Carry-in-0 S, Two bits received, Carry-in-1 Three bits received; Carry-in-0 S Three bits received, Carry-in -1 Write a behavioral Velog description of the state machine. Assume that state changes occur on the falling edge of the clock pulse. Use a case statement together with if-then-else statements to represent the state table

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Step 1

Solution:

The following code is described about the behavioral Verilog description for given state graph. That is,

  • The code is written using the if-then-else statement.
  • State change occurs on the falling edge of the clock pulse is nothing but transition takes place at “negedge”.
    • That is, we are always@ (negedge clk).
  • Check whether the case is “S0”.
    • If the current state is “S1”, then set the “nstate” as “S1” and “Sv” as “10”. Otherwise, set the “nstate” as “S1” and “Sv” as “00”.
  • Check whether the case is “S1”.
    • If the current state is “S1”, then set the “nstate” as “S4” and “Sv” as “00”. Otherwise, set the “nstate” as “S2” and “Sv” as “10”.
  • Check whether the case is “S2”.
    • If the current state is “S1”, then set the “nstate” as “S3” and “Sv” as “10”. Otherwise, set the “ns...

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