Browse Prior Art Database

Enhanced Wrap Capability for Testing Twin-Ax Work Station Controller Hardware

IP.com Disclosure Number: IPCOM000102989D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Comp, CM: AUTHOR [+2]

Abstract

Described is a hardware design that permits a thorough test of a twin-ax work station controller (WSC) using a wrap connector while on a manufacturing card tester. This is in marked contrast to testing twin-ax WSC cards by attaching work stations (W/S) to each port and exercising them or placing a card in a system and exercising the WSC there.

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This is the abbreviated version, containing approximately 64% of the total text.

Enhanced Wrap Capability for Testing Twin-Ax Work Station Controller Hardware

      Described is a hardware design that permits a thorough test of
a twin-ax work station controller (WSC) using a wrap connector while
on a manufacturing card tester.  This is in marked contrast to
testing twin-ax WSC cards by attaching work stations (W/S) to each
port and exercising them or placing a card in a system and exercising
the WSC there.

      Typically, a WSC has one serializer/deserializer (SERDES) that
is shared among multiple ports.  The way the WSC performs a receive
operation is that it transmits a read activate command out to a port,
waits a set amount of time, and then looks for the receive data.
This does not allow using a simple wrap connector for testing the
receive operation.

      With the increasing density of digital logic, it is possible to
design WSC hardware with enhanced test capabilities.  One way to
improve test coverage is to provide two SERDES in a WSC.  For test
purposes, one SERDES is transmitting while the other is receiving.
The following describes this method:
 1.  Connect a wrap connector (i.e. jumper port 0 to 1, port 2 to 3,
etc.  This is dependent on which SERDES drives which ports.).
      2.  Set up SERDES #1 control logic for a receive operation.
3.  Set up SERDES #2 control logic for a transmit operation.
      4.  Start SERDES #1 logic.
           a.  SERDES #1 logic sends a read activate command.
   ...