Browse Prior Art Database

Micro-Channel Shorts Detector

IP.com Disclosure Number: IPCOM000104907D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Rosenberger, WJ: AUTHOR

Abstract

Disclosed is a method to eliminate extensive debugging procedure with a tool to detect shorted pins in the Micro-Channel* card slots.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 62% of the total text.

Micro-Channel Shorts Detector

      Disclosed is a method to eliminate extensive debugging
procedure with a tool to detect shorted pins in the Micro-Channel*
card slots.

      This Tool was developed to detect shorted pins in the
Micro-Channel card slots.  After the manufacturing process, RISC
System/6000 I/O planar boards are debugged, which can be a long
complicated process.  A number of boards were discovered having
shorted adjacent pins on the Micro-Channel card slot connectors
caused by solder flowing between these pins.  This tool not only
detects shorted adjacent pins, it will check each pin to determine
whether it is shorted to any other pin in the card slot.  The only
exception being around pins shorted to ground pins and voltage
shorted to each other.  It is not necessary to make these checks.
Also, voltages shorted to ground are not checked.  This would be an
obvious catastrophic failure and would show up by the power supply
shutting itself down.  Any other SIGNAL pin shorted to another signal
pin or to voltage or ground can be detected.

      THEORY OF OPERATION - Refer to the drawing.  Control logic,
shift registers, LEDs and diodes make up the test circuitry.  The
test card is plugged into the Micro-Channel slot, the card is powered
on, and all shift registers cleared (set to low).  A high level
(logic 1) followed by all lows is then shifted through each register.

      Shorts detection works as follows:  With stimulus applied to
...