Recitation Session 6


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1 Recitation Session 6 CSE341 Computer Organization University at Buffalo March 11, 2016 CSE341 Computer Organization Recitation Session 6 1/26
2 Recitation Session Outline 1 Overview of Digital Logic and Design 2 Gates, Truth Tables and Logic Equations 3 Combinational and Sequential Logic CSE341 Computer Organization Recitation Session 6 2/26
3 Introduction to Digital Logic 1 Digital electronics operate with only two voltage levels of interest  a high and a low voltage 2 Different systems use different voltages. Hence logically 1 represents high and 0 represents low voltage 3 Combinational Logic  No memory. The output of a combinational block depends only on the current input 4 Sequential Logic  Output can depend on both the input and the value stored in memory, which is called the state of the logic block CSE341 Computer Organization Recitation Session 6 3/26
4 Truth Tables 1 Combinational logic block contains no memory, it can be completely specified by defining the values of the outputs for each possible set of input values 2 Such a description is normally given as a truth table 3 For a logic block with n inputs, there are 2 n entries in the truth table, since there are that many possible combinations of input values CSE341 Computer Organization Recitation Session 6 4/26
5 Truth Tables Consider a logic function with three inputs, A, B, and C, and three outputs, D, E, and F. The function is defined as follows 1 D is true if at least one input is true 2 E is true if exactly two inputs are true 3 F is true only if all three inputs are true CSE341 Computer Organization Recitation Session 6 5/26
6 Truth Tables The truth table will contain 2 3 = 8 entries Truth tables can completely describe any combinational logic function; how ever, they grow in size quickly and may not be easy to understand. What can we do?  Use Boolean Algebra CSE341 Computer Organization Recitation Session 6 6/26
7 Boolean Algebra All the variables have the values 0 or 1 and, in typical formulations, there are three operators  AND, OR & NOT 1 D can be formulated as: D = A + B + C 2 F can be formulated as: F = A.B.C 3 How about E? CSE341 Computer Organization Recitation Session 6 7/26
8 Boolean Algebra E is true if exactly two inputs are true. Think of it in two parts: what must be true for E to be true (two of the three inputs must be true), and what cannot be true (all three cannot be true). Thus we can write E as ((A.B) + (B.C) + (A.C)).(A.B.C) We can also derive E by realizing that E is true only if exactly two of the inputs are true. Then we can write E as an OR of the three possible terms that have two true inputs and one false input (A.B. C) + (B.C.Ā) + (A.C. B) CSE341 Computer Organization Recitation Session 6 8/26
9 Logic Gates CSE341 Computer Organization Recitation Session 6 9/26
10 3Bit Decoder Can you build a logicgate implementation for this decoder? CSE341 Computer Organization Recitation Session 6 10/26
11 Sum of Products Representation CSE341 Computer Organization Recitation Session 6 11/26
12 Sum of Products Representation CSE341 Computer Organization Recitation Session 6 12/26
13 ALU  1 bit Adder CSE341 Computer Organization Recitation Session 6 13/26
14 ALU  1 bit Adder CSE341 Computer Organization Recitation Session 6 14/26
15 ALU  1 bit Adder CSE341 Computer Organization Recitation Session 6 15/26
16 ALU  32 bit Adder CSE341 Computer Organization Recitation Session 6 16/26
17 FSM  Finite State Machine CSE341 Computer Organization Recitation Session 6 17/26
18 FSM  Finite State Machine CSE341 Computer Organization Recitation Session 6 18/26
19 How to Build a Finite State Machine CSE341 Computer Organization Recitation Session 6 19/26
20 Traffic Lights Example CSE341 Computer Organization Recitation Session 6 20/26
21 Traffic Lights Example CSE341 Computer Organization Recitation Session 6 21/26
22 Traffic Lights Example  State Transition Table CSE341 Computer Organization Recitation Session 6 22/26
23 Traffic Lights Example  State Diagram CSE341 Computer Organization Recitation Session 6 23/26
24 Traffic Lights Example  State Equations CSE341 Computer Organization Recitation Session 6 24/26
25 Synchronous and Asynchronous FSM CSE341 Computer Organization Recitation Session 6 25/26
26 Flip Flops CSE341 Computer Organization Recitation Session 6 26/26
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