Four Bit ALU

Presented By:

Project Manager: Arturo Coronado

Digital Circuit Design: Rodger Stamness

Clocking: Rodger Stamness

I/O: Juan Tello

Objective

• Familiarization with the full custom IC design methodology.

• Develop good test and debugging skills.

• Learn to work on a team

• Learn documentation procedures

• Have fun!!!!!!

Design Flow

Philips’s 74L181

Specifications

• Functionality: Logic and Arithmetic implementation of Philips 74L181

• Frequency: 25MHz

• Power: 750 mW

• Area: 1800 X 1800

Chip Input & Output Circuits

• Design quality is a critical factor

-Reliability

-Signal Integrity

-Interchip Communication speed

• ESD

-Most prevalent causes for chip failures:

-Manufacturing and Field Operation

Schimtt Trigger

Super Buffer

Padframe Floor plan

Functions

Cell-Base implementation

• A.O.I each function to get circuits.

• Each circuit is turned into a cell.

• Each cell builds up the ALU one cell at time; thus Bottom-Up design.

• Approximately 1/3 of the Design

Transistor Level Design

Cell Z1

Cell-Base implementation

Layout Cellular Design

Final ALU Test Bench

Waveform

Project Update

• Completed:

-15/16 Functional Logic Blocks

-DFF

-Superbuffer

-Schmitt Trigger

• To be Completed

-Final Floor Plan and Verification Block

-Full Layout Assembly and Test

May 15, 2002