Browse Prior Art Database

Run/Stop Signal Handling in Multiprocessor System

IP.com Disclosure Number: IPCOM000112161D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Brooks, JS: AUTHOR

Abstract

This article describes a scheme for providing each processor in a multiprocessor system the ability to report RUN/STOP (+processor running, -processor stopped) status to a scan interface tool designed for a uniprocessor system.

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

Run/Stop Signal Handling in Multiprocessor System

      This article describes a scheme for providing each processor in
a multiprocessor system the ability to report RUN/STOP (+processor
running, -processor stopped) status to a scan interface tool designed
for a uniprocessor system.

      A scan interface tool serially scans the processor(s) under
test, and is used for processor verification, bringup, and debug.  A
scan interface tool requiring RUN/STOP (+processor running,
-processor stopped) status, and designed for a uniprocessor system,
monitors only one RUN/STOP status signal from the system under test.
To provide hardware and software bringup and debug capabilities on a
multiprocessor system, each processor must report it's RUN/STOP
status to the scan interface tool.

      A multiplexer with one RUN/STOP signal input form each
processor in the system, and processor select bits from a "processor
switch" device is used to determine the state of the single RUN/STOP
status signal monitored by the scan interface tool.  The processor
switch is a device that provides the scan interface tool control in
selecting which processor or processor group is active from a scan
interface tool standpoint.  One processor select bit exists for each
processor in the system under test.  If a processor is selected by
the scan interface tool via the processor switch, and that processor
reports a stopped condition, then the scan interface tool will detect
a stopped condition on the RUN...