Simple logic design-what is minterm

Thread Starter

athulascc

Joined Aug 15, 2014
94
here is the image of my assignment
I have knowleadge to do it.
but according to my knowledge minterm is P.Q.R.S here,
but If I fill table in that manner minterm value always 0 or 1
is it correct ; there is problem if it is only 0 or 1Capture.JPG
 

Thread Starter

athulascc

Joined Aug 15, 2014
94
yes I checked that link.
but according to that minterm value is always 0 or 1.

so there is problem with given design.
my SID is 5460449

but they have told that function give output=1 when minterm value = prime number
so how it happens? both 0 & 1 are prime
 

WBahn

Joined Mar 31, 2012
30,045
Look at Table #2 in that link I provided. The minterm value is the number in the left column.

The problem statement has a hole in it. It doesn't say what the output should be if the minterm value doesn't match any of the digits in your SID and it is not prime. Is this a '0' or is it a 'don't care'?
 

WBahn

Joined Mar 31, 2012
30,045
I thought if SID digits match with minterm and not prime, output is 0. am I correct?
The problem explicitly states that if the minterm matches one of the digits in your SID, then the output is a "don't care". That is different than saying that it is a 0 -- it can be either and it doesn't matter which it is.

The problem does not specify what it should output if the minterm does not match one of the digits in your SID and it is not prime. It is not unreasonable to infer that it should be 0 in that case, but the problem does not specify it and, in general, unspecified conditions are treated as "don't cares" -- though it is also, in general, a poor specification that fails to specify all possibilities in some way.
 
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