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fa06-sy-s2 - ECE 2030 Section E Midterm II Solutions...

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1 ECE 2030 Section E Midterm II - Solutions October 27 th , 2006
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2 1. Implement the following truth table using the components identified below A B C F 0 0 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 1 1 1 0 0 1 1 1 0 a) A 3-8 decoder & gates. Clearly label the inputs and outputs of the decoder. b) A 4-1 multiplexor & gates. Clearly label the inputs and outputs of the multiplexor. Decoder C B A 000 111 F MUX F 111 ABC 0 1 2 0 000 1 1 1 1 0 0 0
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3 2. Fill in the truth table below. A B C F 0 0 0 1 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 1 1 1 1 1 MUX decoder decoder F 0 1 2 3 4 5 6 7 1 0 1 0 A B A C ABC 0 1 2 0 1 2 3 0 1 2 3
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4 3. Implement the following expression in the PLA shown by identifying the connections which should be made with an X and setting the value of the ex-or gate input. B C A ABC F A B C
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5 4. What size decoder will be used in a 16 word by 24 bit ROM (number of inputs and number of outputs)? A 4:16 Sized Decoder will be used. 5. Fill in the following table Hexadecimal Octal Binary Base 10 A.B 12.54 1010.1011 10.6875 1.6 1.3 1.011 1.375 6. Provide the hexadecimal value of the double precision floating point representation of
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