four bit arithmetic unit

Discussion in 'The Projects Forum' started by iseeu, May 22, 2008.

  1. iseeu

    Thread Starter New Member

    May 22, 2008
    3
    0
    hi there,

    I have a question which is in regards to computer system architecture and i am stuck. I need some help and it would be greatly appreciated in producing a circuit of a simple four bit arithmetic unit that can add or subtract two 4 bit binary values. Although only four-bit device is required, the design is expected to be easily extended to any word size.

    I am using the digital works application to design this.

    thanks in advance
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Check this website for some information :

    http://www.parl.clemson.edu/~dstanzi/201lab/lab5.html

    You can extend this 4-bit adder/subtractor by adding more full adder stages and XOR gates.

    If you want more information type adder/subtractor circuit in google
     
  3. iseeu

    Thread Starter New Member

    May 22, 2008
    3
    0
    thanks very much for the help really appreciate it
     
  4. iseeu

    Thread Starter New Member

    May 22, 2008
    3
    0
    what if i were to want to modify it and add extra circuitry to enable the ALU to perform multiplication and division. i have found it quite difficult finding information on the multiplication and especially the division any help would be greatly appreciated.
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
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