Question

4.( 5x2 points ) Implement a full subtractor a. Using two 8-to-1 Muxes. Connect X, Y, and Bin to the control inputs of the Muxes and connect 1 or 0 to each data input. 1. Using two 4-to-1 Muxes. Connect X and Y to the control inputs of the Muxes and connect l's, 0's, Bin, or Bin' to each data input.

Answer 1

LIL full - Difference | A full subtractor x- - wood Subtractor - Bin - - Baut - Bondow Truth table X Y Bin D Bout de t Loo ooo C 1 1 0 0 0 LIOL For D I I to od boo a - Fotoli Dl + y Bay 1 A Mux is used to select one of the available inputs as the output For example, 000 is used the to select the 1st input Olo selets the grd input and so on. So we take the 8 values of 'D' from the truth table and put those as the 8 inputs to the Mux Now, two when xy Bin is 000, the it output is selected making the 2 circuits equivalent. Similar for the olf Bout Il tot hierto $* hot-0001 -Bout

Using 4x1 Mux on to 4X1 Mux Here, we need to check for each value of X.Y. Now, in case &xy=oo the value d D is same as d that of Bin. So that's what the it input is. And so on for the other inputs. Similarly for the other output Bout. (s) (so) - Lyxl Mux (S.) (so)