Arithmetic and Logic Unit[edit | edit source]
Introduction[edit | edit source]
The Arithmetic and Logic Unit are not a single entity, but are actually composed of two separate units whose operation is highly dependent on the Select Input(S).
This input is a one-bit input that will decide whether to route the binary variables to the Arithmetic or to the Logic Circuit.
Arithmetic Unit[edit | edit source]
Handles basic operations such as Addition and Subtraction. The Multiplication and Division operations are dependent on the basic operations and Bit-Shifting. The Multiply and Divide operations can also be implemented using Hardwired / Microprogrammed Control.
Logic Unit[edit | edit source]
The Logic unit is a Hardware Unit implemented for performing basic operations such as AND, OR, NAND and NOT. A particular logical operation is selected using a 4:1 Demultiplexer.
The results of all the operations are routed into a data bus for memory addressing.