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Micro Channel Adapter Daughter Card Location Detection

IP.com Disclosure Number: IPCOM000105133D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Daniels, RJ: AUTHOR [+3]

Abstract

Two methods of determining daughter card location within the Micro Channel* Architecture are presented. The first is to add physical keying to the card interconnecting cable to force a particular daughter card location. The second involves added logic so that software can distinguish between different daughter card locations.

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This is the abbreviated version, containing approximately 67% of the total text.

Micro Channel Adapter Daughter Card Location Detection

      Two methods of determining daughter card location within the
Micro Channel* Architecture are presented.  The first is to add
physical keying to the card interconnecting cable to force a
particular daughter card location.  The second involves added logic
so that software can distinguish between different daughter card
locations.

      The Micro Channel Architecture states that daughter cards shall
not respond to -CD SETUP.  With this definition, symmetric card
intercon necting cables are designed that allow a daughter card to
plug in and function properly in either slot that is adjacent to the
base card.  This leads to service, install and configuration problems
because the software cannot determine which adjacent slot the
daughter card is plugged into.  Today's solution is to give specific
instructions on which adjacent slot to put the daughter card into and
then the software must assume that the instructions are properly
followed.

      One better solution is to key one end of the card
interconnecting cable so that it must be plugged into either the base
or daughter card and then design the card interconnecting cable so
that it will only reach one adjacent slot.  The keying plus the card
interconnecting cable length forces the daughter card into one
particular adjacent slot.  The software then can confidently assume
one slot location.  An example keying method is shown in Fig. 1 for
clarity....