Unformatted text preview: The PostFit 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 PostFit 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 PostFit simulation, the output Sum changes in value at 105ns. Therefore, we can calculate the approximate delay as follows: Approximate time delay (ns) =105ns100ns=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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 Fall '08
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 Boolean Algebra, editor, Cybernetics

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