Need help please!!!

Thread Starter

Benbenzino

Joined Nov 15, 2008
2
Can anyone help me please. i don't know where to start.
here the design project.

Design a simple Arithmetic Logic Unit (ALU) which has the following functional units,

  • Data operator: adds and subtracts two, 2 bit binary numbers.
  • Up-Down Counter: counts 0,1,2,3,4,0 (up) or 4,3,2,1,0,4 (down)
  • Comparator: compares two 2 bit numbers.
  • Register: 4 bit parallel-in serial out shift register.
thanks
 
Last edited:

thingmaker3

Joined May 16, 2005
5,073
If I were you, I would begin by reviewing the required building blocks:

Adders
Subtractors (just a different kind of adder)
Digital comparators
Counters
and Shift Registers

If your school's text does not cover these, or if you need these differently stated than in your text, please try here:

http://www.allaboutcircuits.com/vol_4/chpt_9/2.html

http://www.allaboutcircuits.com/vol_4/chpt_11/index.html

http://www.allaboutcircuits.com/vol_4/chpt_12/index.html

A two bit comparator can be built from a pair of XNOR gates.
 
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