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# A circuit

Discussion in 'Homework Help' started by dnkschn, Apr 12, 2009.

1. ### dnkschn Thread Starter New Member

Mar 29, 2009
8
0
I couldn't figure out how to design a circuit with this table:

inputs a b c d and outputs k m
a b c d _ k m
1 0 0 0 _0 0
1 0 0 1 _0 0
1 0 1 0 _0 0
1 0 1 1 _0 0
1 1 0 0 _1 0
1 1 0 1 _0 0
1 1 1 0 _0 0
1 1 1 1 _0 0
0 1 1 1 _0 0
0 1 1 0 _0 0
0 1 0 1 _0 0
0 1 0 0 _0 0
0 0 1 1 _0 1
0 0 1 0 _0 0
0 0 0 1 _0 0
0 0 0 0 _0 0

i mean for example, if a=1 and and bcd=011, when bcd=100, k will be 1,m=0 ; when in opposite case,from bcd=100 to bcd=011, m will be 1,k=0.

How can i make it?

2. ### beenthere Retired Moderator

Apr 20, 2004
15,808
295
Take a look at the two instances where k and m are true. You only have to distinguish those two conditions.

3. ### dsp_redux Active Member

Apr 11, 2009
182
5
Did you make a Karnaugh table of this to Find out the equations needed?

4. ### dnkschn Thread Starter New Member

Mar 29, 2009
8
0
yeah ,i realized that i confused the input labels...

5. ### italo New Member

Nov 20, 2005
205
2
TRY ONE OR GATE FOR ab and cd NAND GATE AND FEEDING A NAND GATE M=1

6. ### thatoneguy Expert

Feb 19, 2009
6,349
732
$K=AB\cdot \overline{CD}$
$M=\overline{AB}\cdot CD$