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Full adder question

n00b

Sep 3, 2014
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Sep 3, 2014
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Hi, guys
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I'm currently simulating a full adder for a lab I have to write a report for.
There is a question in particular that I do not fully understand
1. Proof that S(inverted) is always pulled to ground or Vdd (but never both).

Could someone please elaborate!
 

Harald Kapp

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Nov 17, 2011
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Which signal is S(inverted)? Do you mean /SUM (the input of the output inverter)?
What is the condition for this node to be connected to VDD?
What is the condition for this node to be connected to GND?
Can both conditions be met sumultaneously?

By the way: your schematic would be much better readable if you added the tiny dots where lines cross to indicate an electrical connection. This is standard.
 
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