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Trace Implementation for a Communication Multiplexer

IP.com Disclosure Number: IPCOM000050053D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Avis, RE: AUTHOR [+3]

Abstract

This article describes a trace implementation for a communication multiplexer which enables selective as well as combinational trace activity to be achieved during normal system operation and during selective periods of time. There are four kinds of traces that can be performed by the communication multiplexer. These traces can be utilized singularly or in combination depending on the problem to be detected.

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Trace Implementation for a Communication Multiplexer

This article describes a trace implementation for a communication multiplexer which enables selective as well as combinational trace activity to be achieved during normal system operation and during selective periods of time. There are four kinds of traces that can be performed by the communication multiplexer. These traces can be utilized singularly or in combination depending on the problem to be detected.

Each trace operation is a four-byte group of information. Each group has an identifier code to distinguish the different trace activity. The data is accumulated into a 256-byte data buffer located in the communication multiplexer.

The type of trace desired is invoked from the communication multiplexer CE (customer engineer) panel of the information processing system. The actual start and end of trace activity is under program control of the system.

The command 'activate trace' is issued to the communication multiplexer identifying the line on which trace activity is to take place. The 'deactivate trace' command directed to the same line will cause the current trace buffer to be transferred into the system and end the trace activity.

The trace function requires that two data buffers from the communication multiplexer buffer pool be utilized at all times. As buffers become full and transferred to the system, they are returned to the pool and new buffers become assigned for trace when they become available.

Th...