digital design?

Question

construct an exclusive-NOR gate by interconnecting 2 3-state buffers and two inverters

Answer 1

1. Connect the output of the buffers together (wire OR). That is the output of the XNOR gate.
2. Input A: connect to the Input pin of buffer A.
2b. Invert input A and connect it to the Input pin of Buffer B
3. Input B: connect to the Enable pin of buffer A.
3b. Invert input B and connect it to the Enable pin of Buffer B.

I did a very quick truth table and that's what I came up with.
I am assuming that these buffers have positive logic Enable inputs. If they have inverted Enable inputs then this won't work.

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