Difference between revisions of "ALU in Detail"

Revision as of 11:58, 8 December 2013

Arithmetic and Logic Unit in Detail

You should have heard of an Arithmetic and Logic Unit before, while discussing a Computer CPU or a micro controller. In this tutorial we will look at what an ALU really is?
We will discuss a 4 bit ALU; this would limit many possibilities 16. We would assume that associated registers and instruction set are also 4 bit.

The basic Unit: 1 bit ALU

We assume you are familiar with logic gates, and also have come across a 1 bit adder. It simple adds two 1 bit inputs as shown below.

Inputs		Outputs
A	B	S	C
0	0	0	0
1	0	1	0
0	1	1	0
1	1	0	1

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 {{box|type=l_green_light|text= You should have heard of an Arithmetic and Logic Unit before, while discussing a Computer CPU or a micro controller. In this tutorial we will look at what an ALU really is? <br />
 We will discuss a 4 bit ALU; this would limit many possibilities 16. We would assume that associated registers and instruction set are also 4 bit.<br />
+=== The basic Unit: 1 bit ALU===
+[[File:1bitALU.jpg|400x350px|framed]]
+We assume you are familiar with logic gates, and also have come across a 1 bit adder. It simple adds two 1 bit inputs as shown below.
+}}
 {| class="wikitable" style="text-align:center"
 |-
@@ Line 17: / Line 25: @@
 |-
 |}
-=== The basic Unit: 1 bit ALU===
-[[File:1bitALU.jpg|400x350px|framed]]
-We assume you are familiar with logic gates, and also have come across a 1 bit adder. It simple adds two 1 bit inputs as shown below.
-}}