Tutorial -3

Tutorial -3 - Logic Design Switching Elements The X Gate A...

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Logic Design
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Switching Elements The X Gate A short-circuit to B when C=1 A short-circuit to B when C=0 B C A A B C
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Simple Gates - series A short-circuit to B when C and D equals 1 A B C D
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Simple Gates - parallel A short-circuit to B when C or D equals 1 A B C D
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More complex Gates General design: A B Inputs VDD X First decide what X-gate configuration you need to drive a 1 at the output. Note that only the 1’s is connected to the voltage source Second decide what X- gate configuration is need to drive a 0 to the output Make sure that every possible input samples drives an output Make sure that no possible input combination can drive both a 1 and a 0 simultaneously
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And-2 Gate A B A and B 0 0 0 0 1 0 1 0 0 1 1 1 What is required to drive a 1 to the output: If both inputs are 1, the output should be 1. This is a series configuration VDD X A B
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And-2 Gate (cont.) A B A and B 0 0 0 0 1 0 1 0 0 1 1 1 What is required to drive a 0 to the output: The output is 0 when either of the inputs are 0 This is a parallel configuration, with XNOT- gate B A X GND
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And-2 gate (cont.) Combining both groups B GND A VDD A B X
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This note was uploaded on 04/21/2008 for the course ESCE 221 taught by Professor Ferrie during the Spring '08 term at McGill.

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Tutorial -3 - Logic Design Switching Elements The X Gate A...

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