Browse Prior Art Database

Logging Common On-Chip Processor Commands Using a Support Processor

IP.com Disclosure Number: IPCOM000120101D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 45K

Publishing Venue

IBM

Related People

Bordovsky, JS: AUTHOR [+4]

Abstract

Disclosed is a method for capturing the exact commands that are sent by a support processor through the common-chip processor (COP) [*] interface to the machine under test.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 67% of the total text.

Logging Common On-Chip Processor Commands Using a Support Processor

      Disclosed is a method for capturing the exact commands
that are sent by a support processor through the common-chip
processor (COP) [*] interface to the machine under test.

      In order for the support processor to communicate to the
machine under test, all information must be sent through the COP bus.
This COP bus provides easy, direct access to the machine's internal
registers and embedded arrays in the form of COP bus commands.  All
support processor commands consist of one or more of these COP bus
commands.

      Since a support processor function can perform many COP
commands, it is very hard to know what exact sequence of commands are
being sent to the test machine.  If a problem is encountered, it is
even harder to analyze where the problem occurs.

      A new function can be written for the support processor called
the "coplog." It causes every COP command that goes to the interface
card to also be logged to a file.  This allows the user to see the
exact se- quence of commands that are sent to the test machine.  The
user can vary the degree of messages by choosing one of four levels:
      level 1   Logs all COP commands.
      level 2   Logs all COP commands and hex values of scan strings.
   level 3   Logs all COP commands and the equivalent alter commands
that would generate the scan strings.
      level 4   Logs all of the above.  All COP...