Two-way /bilateral/ digital driver/receiver system using MOS circuits was designed for a multiprocess computer having several subsystems at relatively close locations. The system requires only a single set of communication lines between subsystems, thus achieving lower cost with increased reliability

Burnett, G. J.

Pfeifer, A. F.

English

NASA Technical Reports Server

December 1968	 Brief 68-10437 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Two-Way Digital Driver/Receiver Uses One Set of Lines 
Signal Bus 
A two-way (bilateral) digital driver/receiver system 
using MOS circuits has been designed for a multi-
processing computer having several subsystems at 
relatively close locations. Parallel data transfer be-
tween several locations has required considerable 
duplication of equipment and multiple communication 
lines. The new system requires only a single set of 
communication lines between subsystems, thus achiev-
ing lower cost with increased reliability. 
The basic configuration of the system is illustrated 
in the block diagram. Each logic unit is associated 
with a driver and receiver for each word bit. The logic 
unit sends request signals on individual lines to other 
logic units, which then control the appropriate drivers 
and receivers. The receivers incorporate MOS devices, 
which are of sufficiently high impedance, to permit the 
use of one signal bus.
Note: 
Inquiries concerning this system may be directed to: 
Technology Utilization Officer 
Electronics Research Center 
575 Technology Square 
Cambridge, Massachusetts 02139 
Reference: B68-10437 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546. 
Source: G. J. Burnett and A. F. Pfeifer

of North American Rockwell Corporation

under contract to

Electronics Research Center

(ERC- 10055)
Category 01 
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
Government 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.
https://ntrs.nasa.gov/search.jsp?R=19680000436 2020-03-12T06:00:09+00:00Z


Two-way digital driver/receiver uses one set of lines

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