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4 Bit Arithmetic Logic Unit. Adithya V Kodati Hayagreev Pattabhiraman Vemuri Koneswara Advisor: Dave Parent 12/4/2005. Abstract. Designed a fully functional 4-bit ALU using Philips 74HC/HCT181 schematic. Frequency of operation: 250Mhz Power dissipated : 24.96 mW Area : 676x513uM 2

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4 bit arithmetic logic unit

4 Bit Arithmetic Logic Unit

Adithya V Kodati

Hayagreev Pattabhiraman

Vemuri Koneswara

Advisor: Dave Parent

12/4/2005

abstract
Abstract
  • Designed a fully functional 4-bit ALU using Philips 74HC/HCT181 schematic.
  • Frequency of operation: 250Mhz
  • Power dissipated : 24.96 mW
  • Area : 676x513uM2
  • D-flip flops were used to connect the inputs and outputs
introduction
Introduction
  • The ALU is the basic building block of most digital circuits. Hence having a proper understanding and knowledge of how it should be designed and functions is necessary for a design engineer.
  • Using CMOS design to implement the functions helps one to understand the design flow as well as adept use of Cadence software.
  • This project also builds a strong foundation for other advanced design courses which use different processes to implement functionality.
project details
Project Details
  • Performs full carry look-ahead for arithmetic operation.
  • 16 arithmetic and 16 logical operations
  • Works with active high as well as active low inputs
  • All inputs and outputs are connected via D-flip flops.
table of functions
Table of functions

Courtesy PHILIPS SEMICONDUCTOR

important lessons learnt
Important lessons learnt
  • Divide the circuit into cells. Perform DRC and LVS at each stage.
  • Confine usage of metal3 to the later stages of layout.
  • Design floor plan and routing of major signals before you start the overall layout.
  • Use Cadence lab to the maximum extent.
acknowledgements
Acknowledgements
  • Professor Parent
  • Thanks to Labtam’s Xlitepro for the remote login.
  • Thanks to Cadence Design Systems for the VLSI lab.