Browse Prior Art Database

Built-In Twinaxial Line Monitor for a Work Station Controller

IP.com Disclosure Number: IPCOM000120554D
Original Publication Date: 1991-May-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 4 page(s) / 126K

Publishing Venue

IBM

Related People

Dancker, GA: AUTHOR [+3]

Abstract

A Twinaxial Line Monitor (TLM) is a device that attaches in line with the twinaxial cabling and provides a trace of selected activity to and from the Work Station Controller (WSC). In the past, this unit was separate from the WSC. Described is a hardware design that would incorporate the TLM as part of the WSC.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Built-In Twinaxial Line Monitor for a Work Station Controller

      A Twinaxial Line Monitor (TLM) is a device that attaches
in line with the twinaxial cabling and provides a trace of selected
activity to and from the Work Station Controller (WSC).  In the past,
this unit was separate from the WSC. Described is a hardware design
that would incorporate the TLM as part of the WSC.

      A typical TLM would include the following types of functions:
      1.  Trace Function
           a.  Selected commands or all commands
           b.  Timing information
           c.  Selected data or all data
      2.  Trigger Function
           a.  Selected error or any error
           b.  Selected command
      3.  Print Function

      Since all data to and from the Work Stations (WSs) passes
through the Work Station Controller (WSC), it is fairly simple to
provide a TLM function within the WSC logic.  One possible
implementation would consist of the registers, as shown in Figs. 1
through 3.  These registers could be set up by an "in circuit
emulator" or by the Licensed Internal Code (LIC).

      The Trace Registers (see Fig. 1) determine what activity will
be stored for a trace.

      The Trigger Registers (see Fig. 2) determine when the trace
should be activated.

      The Buffer Registers (see Fig. 3) determine the starting
address of the buffer to be used for storing the trace data and the
size of the buffer.  These will have to be set up to point to an
unused section of the WSC storage. The Buffer registers also include...