KwickClips Computer Systems · 40 sec · free
What do you fill first?
Short answer. The helper column for each gate.
What is Q for A = 0, B = 1, C = 1?
0.
(A NAND B) XOR C
| A B C | A NAND B | Q |
|---|---|---|
| 1 1 1 | 0 | 1 |
| 1 1 0 | 0 | 0 |
| 0 1 1 | 1 | 0 |
Remember
| Helper column per gate |
| Output column last |
A NAND then an XOR. What comes out? Use a helper column. Row one: NAND is zero, XOR one gives one. Row two gives zero. Row three: NAND is one, so zero. Two steps. Helper columns first. Output last.
This clip is from the full lesson: Universal Gates and Combined Logic Circuits: NAND, NOR, XOR — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science Essentials (083), ISC Class 11 Computer Science (868), ISC Class 12 Computer Science (868)
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