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4 bit ALU diagram

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Parth86

Member
hi,
I want to learn some basic I made small 4 bit alu that do only 5 function
arithmetic function
adder
subtractor
logic function
and logic
or logic
nor logic
look the diagram if diagram look like correct then I would like to make complex circuit

upload_2014-9-26_2-11-3.png
 

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absf

Active Member
hi,
I want to learn some basic I made small 4 bit alu that do only 5 function
arithmetic function
adder
subtractor
logic function
and logic
or logic
nor logic
look the diagram if diagram look like correct then I would like to make complex circuit

Your ALU doesn't look right to me.

A theoretical ALU of your design should look something like this...

VEAD'S ALU.PNGVEAD'S ALU 2.PNG

The OR and NOR are not drawn but they should be similar to the AND function. If you study the 74LS181 pdf logic diagram and understand it well. The design would be much simpler and efficient.

Allen
 
Last edited:

Parth86

Member
Your ALU doesn't look right to me.

A theoretical ALU of your design should look something like this...

View attachment 88422

The OR and NOR are not drawn but they should be similar to the AND function. If you study the 74LS181 pdf logic diagram and understand it well. The design would be much simpler and efficient.

Allen
ok thank you very much
 
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