ECE project 1

ECE project 1 - The Post-Fit simulation should be used to...

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Report Questions Q1. From the Behavioral simulation result, what is the output value for each combination of the inputs (draw the truth table)? Is it correct when compared to the Boolean equation derived from Figure 1 (Schematic Editor Window)? Table 1: Truth table for input and output values from the Behavioral Simulation Result Y X Cin Y(XOR)X(XOR)Cin 0 0 0 0 0 0 1 1 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 0 1 1 0 0 1 1 1 1 Table 2: Truth Table for Boolean Equation derived from Schematic Editor Window Clearly, the values for output Sum match with the values of output Y (XOR) X (XOR) Cin. Hence, the output values for each combination of the inputs for the Behavioral Simulation Result are correct. Q2. What is gate delay? Which simulation ( Behavioral or Post-Fit ) should you use to evaluate the system delay that results from gate delay? Gate Delay The length of time it takes for an input change to result in the corresponding output change.
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Unformatted text preview: The Post-Fit simulation should be used to evaluate the system delay that results from gate delay. Q3. What is the approximate delay (in ns) from the change in inputs to that in output Sum ? (Note: From the Behavioral result (Figure 10), when is the first time output Sum changes from 0 to 1? From the Post-Fit result, when is the first time that output Sum changes in value?) For Behavioral simulation, the output Sum changes value from 0 to 1 at 100ns. For Post-Fit simulation, the output Sum changes in value at 105ns. Therefore, we can calculate the approximate delay as follows: Approximate time delay (ns) =105ns-100ns=5ns The approximate delay (in ns) from the change in inputs to that in output Sum is 5ns. Y X Cin Sum 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
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This note was uploaded on 12/07/2011 for the course ECE 261 taught by Professor Staff during the Fall '08 term at Ohio State.

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