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Architecture And Implementation of Diagnostic Loop

IP.com Disclosure Number: IPCOM000100898D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 84K

Publishing Venue

IBM

Related People

Kumaki, A: AUTHOR [+4]

Abstract

Described is a technique that permits one subsystem to detect a hardware problem or a software problem in other subsystems with simple logic in a loosely coupled multi-processing system. This technique is widely applicable to a system which consists of plural subsystems.

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Architecture And Implementation of Diagnostic

Loop

       Described is a technique that permits one subsystem to
detect a hardware problem or a software problem in other subsystems
with simple logic in a loosely coupled multi-processing system.  This
technique is widely applicable to a system which consists of plural
subsystems.

      Generally, a loosely coupled multi-processing system uses a
high-level communication protocol to exchange the data between one
subsystem and another subsystem.  However, it is very difficult to
send the status from a subsystem or to control a malfunction in a
subsystem when trouble occurs on some subsystem in the system.

      As shown in Fig. 1, the high-level communication protocol uses
a communication path, which may be a coaxial cable, a serial
communication way, etc.  A diagnostic loop is different from the
communication path and it is not affected by the communication path
and does not affect the communication path.  If Subsystem 1 requires
the status of Subsystem 2 whose communication path does not work,
Subsystem 1 can get the status of Subsystem 2 through the diagnostic
loop.

      The diagnostic loop is shown in Fig. 2.  The system shown in
Fig.  2 has 15 slots in which any subsystem can be installed.  Some
slots may be empty.  The diagnostic loop consists of five control
signals and one data line.  If a subsystem is installed in a slot,
the data line passes through the subsystem with a selector.  In Fig...