I am having trouble understanding the highlighted portion, see attached.
I understand that in a BCD, range from 0 to 9, so in a truth table 10 to 15 are "Dont cares." But how in the truth table attached are they "Dont care?"
Thanks in advance.
I understand that in a BCD, range from 0 to 9, so in a truth table 10 to 15 are "Dont cares." But how in the truth table attached are they "Dont care?"
Thanks in advance.
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