Arithmetic logic unit

A symbolic representation of an ALU and its input and output signals, indicated by arrows pointing into or out of the ALU, respectively. Each arrow represents one or more signals. Control signals enter from the left and status signals exit on the right; data flows from top to bottom.

In computing, an arithmetic logic unit (ALU) is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers.[1][2] This is in contrast to a floating-point unit (FPU), which operates on floating point numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit (CPU) of computers, FPUs, and graphics processing units (GPUs).[3]

The inputs to an ALU are the data to be operated on, called operands, and a code indicating the operation to be performed; the ALU's output is the result of the performed operation. In many designs, the ALU also has status inputs or outputs, or both, which convey information about a previous operation or the current operation, respectively, between the ALU and external status registers.

  1. ^ Atul P. Godse; Deepali A. Godse (2009). "3". Digital Logic Design. Technical Publications. pp. 9–3. ISBN 978-81-8431-738-1.[permanent dead link]
  2. ^ Atul P. Godse; Deepali A. Godse (2009). "Appendix". Digital Logic Circuits. Technical Publications. pp. C–1. ISBN 978-81-8431-650-6.[permanent dead link]
  3. ^ "1. An Introduction to Computer Architecture - Designing Embedded Hardware, 2nd Edition [Book]". www.oreilly.com. Retrieved 2020-09-03.

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