Converting BCD Truth Table to Output Functions Using K-Maps

Thread Starter

Hollow93

Joined Nov 21, 2017
3
To be honest, I'm just looking to see if I'm on the right track with a certain question.



This here would be my answer for the K-Map for the "H" output function and im just curious if im on the right path here. Any input would be appreciated.

 

WBahn

Joined Mar 31, 2012
32,777
Not too happy about their table. They show rows in which all of the inputs are don't cares. That makes zero sense. Then, in those rows, they show the outputs all being LO but add a not telling you to treat them as don't cares. Sloppy.

The inputs should properly encode the values in the left column and then all of the output columns in those rows should have 'x' in them.

But, the intent is pretty obvious.

Then YOU get sloppy.

Your inputs in the table are 1, 2, 4, and 8, but then your K-map uses A, B, C, and D with no indication of how they relate. If I'm a grader, I'm not going to waste my time trying to figure it out. Your function uses four unknown inputs and you don't use any of the four given inputs. Therefore it can't work and gets a zero.

Clean this up and try again.

Also, circle your groupings, because it looks like you are missing some real opportunities to minimize things here.
 

Thread Starter

Hollow93

Joined Nov 21, 2017
3
Not too happy about their table. They show rows in which all of the inputs are don't cares. That makes zero sense. Then, in those rows, they show the outputs all being LO but add a not telling you to treat them as don't cares. Sloppy.

The inputs should properly encode the values in the left column and then all of the output columns in those rows should have 'x' in them.

But, the intent is pretty obvious.

Then YOU get sloppy.

Your inputs in the table are 1, 2, 4, and 8, but then your K-map uses A, B, C, and D with no indication of how they relate. If I'm a grader, I'm not going to waste my time trying to figure it out. Your function uses four unknown inputs and you don't use any of the four given inputs. Therefore it can't work and gets a zero.

Clean this up and try again.

Also, circle your groupings, because it looks like you are missing some real opportunities to minimize things here.
See I was actually pretty confused as to why our inputs were 1, 2, 4 and 8. Should I just inform the grader in the beginning and say that let A = 1, B = 2, C = 4, and D = 8? (And then circle the grouping like you said which ill do in a moment). Im honestly just concerned whether the K-map was done correctly right now.
 
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