Draw the logic diagram of an eight-input, three-output encoder whose truth table is given in Table 2-2. What is the output when all the inputs are equal to 0? What is the output when only input D_o is equal to 0? Establish a procedure that will distinguish between these two cases.

Table 2-2

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D7 D6 OO 0 0 0 0 0 1 0 0 0 0 0 0 TABLE 2-2 Truth Table for Octal-to-Binary Encoder Inputs 1 0 Ds 00 0 0 1 HO 0 D4 O 0 0 0 1 0 OOO D3 OO 0 1 0 0 0 0 D₂ OO 1 0 0 0 0 0 D₁ 0 0 0 0 0 Do 10 0 0 0 0 0 A₂ 0 0 0 1 1 1 1 Outputs A₁ T100 0 0 1 1 Ao 1 0 1 0 1