6.29 please. don\'t understand. thanks r with the equations given in Section 694

Question

6.29 please. don't understand. thanks

r with the equations given in Section 694, write a complete logic expres- Sartn th AEOBOUT output of the 74x85. SDATA on for theA ith the logic diagram for the 74x682, write a logic output in terms of the inputs. expression for the PEQO L an algebraic expression for s3, the forth sum bit of a binary adder, as a ion of inputs ??, xi, x2, X3, yo» yl, y2, and y3. Assum e that C070, and do not function atempt to "multiply out" or minimize the expression. Using the information in Table 6-3 for 74LS components, determine the maxi- 0 Using mum propagation delay from any input to any output of the 16-bit group ripple adder of Figure 6-89. You may use the "worst-case" analysis method Exercises

Explanation / Answer

Two 4-bit inputs are

x3x2x1x0 and   y3y2y1y0

Carry from x0 and y0 C1=C0(x0 xor y0) + x0y0 = x0y0

Carry from x1 and y1 C2=x0y0(x1 xor y1) + x1y1

Carry from x2 and y2 C3=C2(x2 xor y2) + x2y2 =(x0y0(x1 xor y1) + x1y1)(x2 xor y2) + x2y2

SUM S3 = (x3 xor y3 xor C3)

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