Logic gate circuits - What does two-level and multi-level mean?

[jayjay112]

What do "two-level" and "multi-level" gate circuits mean?

I have been doing questions relating to logic gates circuits, and have noticed that some questions say "implement with two-level NAND gate circuts"

And then a different question would say "implement with multi-level NOR gate circuts"

Thanks

Jay

 

[willem2]

Two-level means there's a maximum of two gates between the input and the output.
The more levels you use, the longer the slower the circuit gets.

 

[jayjay112]

Thanks