With the help of that PI and EPI can be formed correctly and in the case of larger expression 'X' is still used in Tabulation and VEM methods as well.Ī hazard is a condition when a change in output occured but actually no change should occur. The use of 'X' helps us to group the variables in the k map and helps useful in further simplification of the expression. ✓ Grouping of the Variables and the Implicants, Prime Implicants: While grouping the SOP or POS terms in a K-map if you group certain bits along with 'X' it will reduce the switching of the states and hence less memory space is required which ultimately results in less power consumption.Īnd most importantly it uses Gray encoding which results in less transition of states. Less power dissipation or having less consumption of power is one of the primary factor while designing VLSI circuits and using don't care technique is one among them. Not only this, the use of 'X' in digital design has several other advantages which are mentioned below: Karnaugh Map or K-map is often used to minimise digital logic expression.īut among that one of the most important parameter is 'X' or don't care which helps in pairing the minterms or maxterms for SOP and POS expression to simplify the expression.
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