Read the questions carefully before answering them. Make sure your answers to the problems are clear...

 

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Read the questions carefully before answering them. Make sure your answers to the problems are clear and concise, as you will be graded on what you have written and not on what you may have meant. This exam is open notes, books, etc. You can use the computer to write VHDL code. 1. (10 points) A digital circuit accepts binary-coded-decimal inputs (only the numbers from Ois to 910). The numbers are encoded using 4 bits A, B, C, D. The output F is High if the decimal equivalent of the input is an even number. For numbers greater than 9o the output is x (don't care). For the input 0000, consider the output 1. a) Complete the truth table for this function. b) Write the expression for F as Sum-of-Product. A B C D 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 0 0 T 1 1 I 0 0 0 1 0 1 0 0 1 1 1 1 0 1 0 I 0 0 0 T 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Read the questions carefully before answering them. Make sure your answers to the problems are clear and concise, as you will be graded on what you have written and not on what you may have meant. This exam is open notes, books, etc. You can use the computer to write VHDL code. 1. (10 points) A digital circuit accepts binary-coded-decimal inputs (only the numbers from Ois to 910). The numbers are encoded using 4 bits A, B, C, D. The output F is High if the decimal equivalent of the input is an even number. For numbers greater than 9o the output is x (don't care). For the input 0000, consider the output 1. a) Complete the truth table for this function. b) Write the expression for F as Sum-of-Product. A B C D 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 0 0 T 1 1 I 0 0 0 1 0 1 0 0 1 1 1 1 0 1 0 I 0 0 0 T 0 1 0 1 0 1 0 1 0 1 0 1 0 1