ECE 331 Digital System Design
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1 ECE 331 Digital System Design State Reduction and Derivation Flip-Flop Input Equations (Lecture #23) The slides included herein were taken from the materials accompanying Fundamentals of Logic Design, 6 th Edition, by Roth and Kinney, and were used with permission from Cengage Learning.
2 Sequential Circuit Design 1. Understand specifications 2. Draw state graph (to describe state machine behavior) 3. Construct state table (from state graph) 4. Perform state reduction (if necessary) 5. Assign a binary value to each state (state assignment) 6. Create state transition table 7. Select type of Flip-Flop to use 8. Derive Flip-Flop input equations and FSM output equation(s) 9. Draw circuit diagram Spring 2011 ECE Digital System Design 2
3 State Reduction Spring 2011 ECE Digital System Design 3
4 Equivalent States Two states, p and q, of a sequential logic circuit, are equivalent iff for every input X, the outputs are equal the next states are equivalent. λ(p, X) = λ(q, X) Specifies the output given the present state and the input δ(p, X) == δ(q, X) Specifies the next state given the present state and the input Note: the next states do not need to be equal, just equivalent. Spring 2011 ECE Digital System Design 4
5 Determination of Equivalent States a b iff d f and c h a d iff a d and c e Spring 2011 ECE Digital System Design 5
6 FSM Design: Mealy Example: Design a sequence detector. The circuit (again) is of the form: serial bit stream (input) output (serial bit stream) Spring 2011 ECE Digital System Design 6
7 Example: Sequence Detector (Mealy) The sequential circuit has one input (X) and one output (Z). It examines groups of four consecutive inputs and produces an output Z = 1 if the input sequence 0101 or 1001 occurs. The circuit resets after every four inputs. A typical input and output sequence is: X = Z = (time: ) Spring 2011 ECE Digital System Design 7
8 Example: Sequence Detector (Mealy) State Table Spring 2011 ECE Digital System Design 8
9 Example: Sequence Detector (Mealy) Eliminating Redundant States Spring 2011 ECE Digital System Design 9
10 Example: Sequence Detector Since states H and I have the same next states and the same outputs, there is no way of telling states H and I apart. We can replace I with H. Spring 2011 ECE Digital System Design 10
11 Example: Sequence Detector (Mealy) Reduced State Table Spring 2011 ECE Digital System Design 11
12 Example: Sequence Detector Reduced State Graph Spring 2011 ECE Digital System Design 12
13 State Reduction using an Implication Chart Spring 2011 ECE Digital System Design 13
14 State Reduction using an I.C. 1.Construct an Implication Chart which contains a square for each pair of states (i, j). 2.Compare each pair of rows in the State Table. If outputs for states i and j are different, put an X in the corresponding square of the I.C. If outputs for states i and j are the same, indicate the implied pairs in the corresponding square of the I.C. If outputs and next states for states i and j are the same, put a check in the corresponding square of the I.C. Spring 2011 ECE Digital System Design 14
15 State Reduction using an I.C. 3.If square i-j contains the implied pair m-n, and square m-n contains an X, then i<>j, and an X must be placed in the corresponding square of the I.C. 4.If X's were added in step 3, repeat step 3 until no more X's are added. 5.For each square i-j, which does not contain an X, i==j. Spring 2011 ECE Digital System Design 15
16 Example: State Reduction using an I.C. Spring 2011 ECE Digital System Design 16
17 Example: State Reduction using an I.C. Spring 2011 ECE Digital System Design 17
18 Example: State Reduction using an I.C. Spring 2011 ECE Digital System Design 18
19 Example: State Reduction using an I.C. After first pass. Spring 2011 ECE Digital System Design 19
20 Example: State Reduction using an I.C. After second pass. Spring 2011 ECE Digital System Design 20
21 Example: State Reduction using an I.C. d = = a e = = c d and e are removed from the State Table Spring 2011 ECE Digital System Design 21
22 Future site of another example. Spring 2011 ECE Digital System Design 22
23 Derivation of Flip-Flop Input Equations Spring 2011 ECE Digital System Design 23
24 Derivation of FF Input Equations 1. Assign a binary value to each state in the reduced state table (state assignment). 2. Construct the state transition table. Include in the state transition table, columns for the Flip-Flop inputs. 3. Construct the K-maps for the Flip-Flop inputs. 4. Derive the minimized FF input equations. Spring 2011 ECE Digital System Design 24
25 Derivation of FF Input Equations Example #1: Derive the Flip-Flop input equations for the following sequential logic circuit. Assume that D Flip-Flops are used in the design. Excitation Equation: D = Q + Spring 2011 ECE Digital System Design 25
26 Example #1: FF Input Equations State Table Spring 2011 ECE Digital System Design 26
27 Example #1: FF Input Equations 1. Assign a binary value to each state. 2. Construct the state transition table. A + B + C + D A D B D C Z ABC X = 0 X = 1 X = 0 X = 1 X = 0 X = Spring 2011 ECE Digital System Design
28 Example #1: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. D A = D B = Spring 2011 ECE Digital System Design 28
29 Example #1: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. D C = Spring 2011 ECE Digital System Design 29
30 Derivation of FF Input Equations Example #2: Derive the Flip-Flop input equations for the following sequential logic circuit. Assume that JK Flip-Flops are used in the design. Excitation Table: Q Q + J K x x 1 0 x x 0 Spring 2011 ECE Digital System Design 30
31 Example #2: FF Input Equations State Table Spring 2011 ECE Digital System Design 31
32 Example #2: FF Input Equations 1. Assign a binary value to each state. 2. Construct the state transition table. A + B + C + J A K A J B K B J C K C ABC X = 0 X = 1 X = 0 X = 1 X = 0 X = 1 X = 0 X = ECE Digital System Design 32
33 Example #2: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. J A = K A = Spring 2011 ECE Digital System Design 33
34 Example #2: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. J B = K B = Spring 2011 ECE Digital System Design 34
35 Example #2: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. J C = K C = Spring 2011 ECE Digital System Design 35
36 Derivation of FF Input Equations Example #3: Derive the Flip-Flop input equations for the following sequential logic circuit. Assume that SR Flip-Flops are used in the design. Excitation Table: Q Q + S R x x 0 Spring 2011 ECE Digital System Design 36
37 Example #3: FF Input Equations State Table Spring 2011 ECE Digital System Design 37
38 Example #3: FF Input Equations 1. Assign a binary value to each state. 2. Construct the state transition table. A + B + S A R A S B S B AB X=00 X=01 X=11 X=10 X=00 X=01 X=11 X=10 X=00 X=01 X=11 X= Spring 2011 ECE Digital System Design 38
39 Example #3: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. S A = R A = Spring 2011 ECE Digital System Design 39
40 Example #3: FF Input Equations 3. Construct K-maps for Flip-Flop inputs. 4. Derive the minimized FF input equation. S B = R B = Spring 2011 ECE Digital System Design 40
41 Questions? Spring 2011 ECE Digital System Design 41
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