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2006-1546: The Benefits of using Orcad-PSpice when Designing ROM devices Saeid Moslehpour, University of Hartford The author is assistant professor in the Department of Electrical and Computer Engineering

Racquel Brown, University of Hartford The author graduated from the University of Hartford

Abstract

For a long time TTL (Transistor Transistor Logic) integrated circuits (7400 series) have been used to design digital circuits, with the creation of ROM (Read Only Memory), SPLD (Simple Programmable Logic Devices), CPLD (Complex Programmable Logic Devices) and FPGA (Field Programmable Gate Array). This paper discusses the programming and simulation of ROM family devices such as EPROM (Erasable Programmable Read Only Memory), E2PROM (Electronically Erasable Programmable Read Only Memory) and Flash ROM and their uses in the practical engineering environment. We are using PSpice software to program ROM family devices. The PSpice manual provides little information about the procedures of ROM programming. The following steps will include programming the chip in PSpice which is similar to programming the actual ROM devices.

Introduction

In most digital textbooks used in colleges and universities today, ROM family devices are not mentioned in great detail. It is important for the students of electrical and computer engineering to receive a great detail about ROM devices family. These products and other integrated circuits such as SPLDs , CPLDs and FPGAs are used to develop the latest dynamic logic programming. Once students understand the behavior of the ROM devices, they will be able to design and implement the basic logic and other circuit logics such as state machines which can be used to implement real world applications1.

We are using an interactive computer simulation program called Orcad-PSpice. This program provides students with a teaching environment to virtually design digital and analog circuits. The ROM programming starts from simulation and goes on to programming the real devices. A program called TT2ROM is used along with Orcad-PSpice to make the student fully comprehend the usage of these devices. The TT2ROM program is used to produce an Intel Hex File and then these files are linked to Orcad-PSpice for simulation purposes. Students now have the opportunity to design and program their information onto ROM devices2.

Orcad-PSpice is an electronic simulator used to test and design analog and digital circuits as well as designing printed circuit boards. The Orcad Capture is only one part of the Orcad-PSpice family of programs which is used to test and design circuits. Orcad-PSpice has the following features allowing designs to be high-speed and exact:

• Quick and easy schematic editing

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Moslehpour, S., & Brown, R. (2006, June), The Benefits Of Using Orcad Pspice When Designing Rom Devices Paper presented at 2006 Annual Conference & Exposition, Chicago, Illinois. 10.18260/1-2--894