Fall2001Test 2b1

# Fall2001Test 2b1 - Problem 3(20 Points Give a truth table...

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ECE 2030 Test 2 Fall 2001 Dr. Heck This is a closed book, closed notes test. No calculators are allowed. You have 50 minutes to complete the test. Please show all of your work. Please abide by the Georgia Tech academic honor code. Violations will be handled in the appropriate manner. Name: _________________________________ Problem Possible Points Score 1 18 2 20 3 20 4 20 5 22 Total 100

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Problem 1 (18 Points): a) Add the following 6-bit unsigned numbers and determine if there is an error. 1 0 0 0 1 0 0 1 1 0 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 1 0 0 1 0 1 1 0 1 Error?: b) Add the following 6-bit signed numbers and determine if there is an error. 0 0 1 1 1 0 0 1 1 0 0 1 1 0 1 1 0 0 0 1 1 1 1 0 1 0 1 0 1 1 0 1 1 0 0 1 Error?:
Problem 2 (20 Points) a) A priority encoder has inputs D 0 - D 3 and outputs A 0 , A 1 and V (V=1 if the input is valid). The priority is D 0 >D 1 >D 2 >D 3. Fill in the truth table for the encoder and derive simplified expressions for the outputs. D 3 D 2 D 1 D 0 A 1 A 0 V b) Design a 2 to 1 MUX using only NAND and NOT gates (do not use transmission gates). A 2 to 1 MUX S F B

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Unformatted text preview: Problem 3 (20 Points): Give a truth table that shows all the stable operating states for this circuit. S Q Q R Consider the following sequence for S and R. SR = 01, SR = 00, SR = 11, SR = 10, SR = 00 Fill in the corresponding output for Q into the table. SR 01 00 11 10 00 Q Problem 4 (20 Points): Complete the timing diagram for the following circuit. Assume that all initial stored bits are zero. WE IN OUT φ 2 φ 1 IN φ 2 OUT φ 1 L L 2to1 MUX WE Problem 5 (22 Points): A state machine has the following truth table where A is the input. A S 2 S 1 S NS 2 NS 1 NS 0 1 0 0 0 0 1 0 1 0 0 1 1 0 0 1 0 1 0 0 0 0 1 0 1 1 1 1 1 1 1 0 0 1 0 1 1 1 0 1 1 0 0 1 1 1 0 0 0 1 1 1 1 1 0 1 1 0 X X X 0 1 0 a) Draw the state transition diagram. b) Use a decoder to design the combinational logic. c) Show the schematic of the entire state machine including the decoder....
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Fall2001Test 2b1 - Problem 3(20 Points Give a truth table...

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