# simple logic circuit

#### yagmai

Joined May 19, 2005
3
Dear all, I kind of confuse by the question.

A logic circuit has 5 inputs: A*, B, C*, D*, E and one output Y. The ouput Y is asserted if one or more of the following conditions occurs:

. A*, C* and E are all asserted
. B is asserted but neither A* nor D*is asserted
. B is negated but D* or E is asserted

Using suitable logic symbols, draw a clearly labelled logic circuit diagram to illustrate the circuits's behaviour.

The B* asserted , A asserted is confusing me. Thanks

#### Brandon

Joined Dec 14, 2004
306
Originally posted by yagmai@Nov 2 2005, 11:32 PM
Dear all, I kind of confuse by the question.

A logic circuit has 5 inputs: A*, B, C*, D*, E and one output Y. The ouput Y is asserted if one or more of the following conditions occurs:

. A*, C* and E are all asserted
. B is asserted but neither A* nor D*is asserted
. B is negated but D* or E is asserted

Using suitable logic symbols, draw a clearly labelled logic circuit diagram to illustrate the circuits's behaviour.

The B* asserted , A asserted is confusing me. Thanks
[post=11437]Quoted post[/post]​
If B is asserted, then it means that B* is not. I.e. If B is True,. B* is False
If B* is asserted then B is NOT. i.e. if B* is True then B is False

Get it?

The word but typically means AND in logic, Asserted = TRUE, Negated = FALSE, Neither __ nor __ also is AND. Or is obvious. Just like is substitutes for an = sign in word problems, etc.

Hope this helps.