digital adder circuits

Discussion in 'Homework Help' started by gorejena ashford, May 19, 2012.

  1. gorejena ashford

    Thread Starter New Member

    May 19, 2012
    1
    0
    hello everyone.Im stuck on the following question:a student designed a parallel binary adder for industry to add two 3 bit binary numbers together and display the sum and carry words in decimal on seven segment displays.The student wanted to economise the design and used a HAlf ADDER for the least and most significant bits.A FULL ADDER was used for the middle bits.If 5 and 7(decimal) are input,what will the sum word in decimal?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    A=101 [decimal 5]
    B=111 [decimal 7]

    LSB [Bit '0'] Half Adder
    A(0)=1
    B(0)=1
    Sum(0)=0
    Carry_out(0) =1

    Middle Bit [Bit '1'] Full Adder
    Carry_in(1)=Carry_out(0) =1
    A(1)=0
    B(1)=1
    Sum(1)=0
    Carry_out(1) = 1

    MSB [Bit '2'] Half Adder
    A(2)=1
    B(2)=1
    Sum(2)=0
    Carry_out(2)=1
     
Loading...