In K-Map, you might find some cells, where each cell represents with the letter X. This X is.called "Don't care". When forming groups of cells, don't care conditions (X) are cons allows us to form a larger group than would otherwise be possibl cares. There is no requirement to group all or any of the don't cares.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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In K-Map, you might find some cells, where each cell represents a minterm, filled
with the letter X. This X is called "Don't care".
When forming groups of cells, don't care conditions (X) are considered as 1, if this
allows us to form a larger group than would otherwise be possible without the don't
cares.
There is no requirement to group all or any of the don't cares.
Rule: Only use the Don't cares in a group if this simplifies the logic.
Based on the above note, and applying the same K-Map rules, you areasked to
answer the below questions for the below 4-variable K-Map:
a- Encircle the groups that should be considered, using a minimum number of
X's where necessary to obtain the optimal solution.
N.B: Your solution is considered optimal, if you have involved the minimum
number of minterms to simplify the function using K-map with the don't cares.
b- Write the simplified equation of the function F. c- Find the complement (F') of
the simplified F. Apply De Morgan's law and show the steps. You can keep it
in the POS form.
d- Draw the logic diagram of the simplified F using only NAND gates.
F
C'D'
C'D
CD
CD'
A'B'
1
1
A'B
1
AB
1
AB'
1
X
Transcribed Image Text:In K-Map, you might find some cells, where each cell represents a minterm, filled with the letter X. This X is called "Don't care". When forming groups of cells, don't care conditions (X) are considered as 1, if this allows us to form a larger group than would otherwise be possible without the don't cares. There is no requirement to group all or any of the don't cares. Rule: Only use the Don't cares in a group if this simplifies the logic. Based on the above note, and applying the same K-Map rules, you areasked to answer the below questions for the below 4-variable K-Map: a- Encircle the groups that should be considered, using a minimum number of X's where necessary to obtain the optimal solution. N.B: Your solution is considered optimal, if you have involved the minimum number of minterms to simplify the function using K-map with the don't cares. b- Write the simplified equation of the function F. c- Find the complement (F') of the simplified F. Apply De Morgan's law and show the steps. You can keep it in the POS form. d- Draw the logic diagram of the simplified F using only NAND gates. F C'D' C'D CD CD' A'B' 1 1 A'B 1 AB 1 AB' 1 X
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