Circuit design and mask development sequence are improved by using general purpose computer with interactive graphics capability establishing efficient two way communications link between design engineer and system. Interactive graphics capability places design engineer in direct control of circuit development

Schansman, T. T.

English

NASA Technical Reports Server

July 1971	 Brief 71-10238 
NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield; Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Computer-Aided Design of Large-Scale Integrated Circuits: A Concept 
A computer study effort has been undertaken to 
develop a software program for the computer-aided 
design of the photographic masks necessary for in-
tegrated circuit fabrication. The circuit design and 
mask development sequence have been considerably 
improved by the use of a general purpose computer 
with an interactive graphics capability that es-
tablishes an efficient two-way communications link 
between the design engineer and the system. The
Although the functional design of the computer 
program was accomplished under the constraint of 
using an available small system, additional capability 
can readily be developed with the established design 
concepts. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Code A&TS-TU 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B71-10238 
Patent status: 
No patent action is contemplated by NASA. 
Source: T. T. Schansman of 
M&S Computing, Inc.
under contract to

Marshall Space Flight Center

(MFS-20600) 
interactive graphics capability places the design engi- 
•neer in direct control of circuit development. 
The final report of the study contains a dis-
cussion of: the functional design of the baseline soft-
ware; the processor requirements, including initial 
storage estimates and input/output requirements; the 
designer/computer communication interface, both 
with and without a graphics terminal; and the stand-
ardized placement and interconnect ground rules es-
tablished during the study phase.
Category 09 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Governmtht assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Computer-aided design of large-scale integrated circuits - A concept

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