Consider a logic circuit with 8 input lines (D0, D1, …, D7) and 3 output lines (A0, A1, A2) specified by:
A2 = D4 + D5 + D6 + D7
A1 = D2 + D3 + D6 + D7
A0 = D1 + D3 + D5 + D0
where + is logical OR. This circuit is a(n)
Pick an option to check yourself, or open the answer below.
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Correct answer: C. Octal to binary encoder
Explanation
These are the plain OR equations of an 8-to-3 (octal-to-binary) encoder; the last term should read D7 as in the standard circuit. A priority encoder needs extra AND/NOT terms so that the highest active input wins, which these equations lack.More Computer System Architecture questions
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