Decoder help???????

Discussion in 'Homework Help' started by ne5pats, Apr 17, 2011.

1. ne5pats Thread Starter New Member

Mar 5, 2011
13
0
Hello i been trying to figure out what codes do gate 1, gate 2, and gate 3 decode in the picture attached. please help

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2. beenthere Retired Moderator

Apr 20, 2004
15,815
293
Make a truth table. The Y term depends on the states of A0 - A2.

3. Georacer Moderator

Nov 25, 2009
5,177
1,284
I wouldn't call it a decoder, but rather a random Boolean function. It is expressed in a Product of Sums form.

4. ne5pats Thread Starter New Member

Mar 5, 2011
13
0
y = 0
0
1
1
0
1
0
0

But, now? i dont understand what codes do gate 1, gate 2, and gate 3 decode )it's a question in a review sheet

5. ne5pats Thread Starter New Member

Mar 5, 2011
13
0
and its in SOP

6. beenthere Retired Moderator

Apr 20, 2004
15,815
293
Y is in one state for some states of A0 - A2, and the other for the remaining states of A0 - A2. Is there some common condition of the inputs for Y = 1, or for Y = 0?

7. ne5pats Thread Starter New Member

Mar 5, 2011
13
0
oh i see it - they gave me some conditions in a timing diagram....THANKS

8. Georacer Moderator

Nov 25, 2009
5,177
1,284
Of course it is. My fingers slipped.
Sorry for the misinformation.