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

 

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.

 

Hello,

A great amount of information can be found in the links of the EDUCYPEDIA.
http://www.educypedia.be/electronics/digitallogic.htm

There are more pages on digital electronics over there:

Digital electronics:
Arithmetic circuits D/A-A/D converters Number systems Codes and decoders Flip flops Technology Counters and registers General overview Technology-CMOS Digital logic Memories Technology-TTL Timers and oscillators

Greetings,
Bertus

 

Thanks Guy !!! That really help.