lab4 - State University of New York at Stony Brook...

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State University of New York at Stony Brook Department of Electrical and Computer Engineering ESE 218 Digital Systems Design Spring 2009 Lab 4. Code Converter 1. Objectives Your task is to design a three-bit Binary-to-Ex-3 converter . It was reduced to three bits for circuit simplicity. Excess-3 code is obtained from the binary one by addition of 3. The block diagram is shown in Figure 1. The binary code is applied to the combinational circuit inputs I 0 , I 1 and I 2 and the circuit produces output functions O 0 , O 1 and O 2 in accordance with the truth table Figure 1. Binary Excess-3 Decimal code I 2 I 1 I 0 O 2 O 1 O 0 0 0 0 0 0 1 1 1 0 0 1 1 0 0 2 0 1 0 1 0 1 3 0 1 1 1 1 0 4 1 0 0 1 1 1 5 1 0 1 0 0 0 6 1 1 0 0 0 1 7 1 1 1 0 1 0 Excess-3 code is an example of self-complementing codes. Such codes have the property that the 9’s complement of a decimal number is obtained directly by changing 1’s to 0’s and 0’s to 1’s in this code (verify it for decimal codes 2 and 7, 3 and 6, 4 and 5). Although the truth table representation of a function is unique, the implementation can appear in many different forms. In the prelab you can practice with algebraic manipulations to obtain the implementation with a minimal number of 74LS chips (see the text below). I 0 I 1 I 2 O 0 O 1 O 2 Binary code Excess-3 code Logic gates
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2 2. Preliminary lab 1. Logic maps The output functions can be simplified by various methods including al gebraic manipulation, K-map or by means of algorithmic methods .
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This note was uploaded on 04/12/2009 for the course ESE 218 taught by Professor Donetsky during the Spring '08 term at SUNY Stony Brook.

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lab4 - State University of New York at Stony Brook...

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