Browse Prior Art Database

Processor Card Connector for Two Symmetric Multiprocessor Upgrade Cards

IP.com Disclosure Number: IPCOM000117816D
Original Publication Date: 1996-Jun-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Barnhart, SR: AUTHOR

Abstract

Disclosed is a single connector for two Symmetric Multiprocessor (SMP) upgrade cards. The advantages of a single connector including improved signal quality, better reliability and the ability to save space on a planar is discussed.

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This is the abbreviated version, containing approximately 92% of the total text.

Processor Card Connector for Two Symmetric Multiprocessor Upgrade
Cards

      Disclosed is a single connector for two Symmetric
Multiprocessor (SMP) upgrade cards.  The advantages of a single
connector including improved signal quality, better reliability and
the ability to save space on a planar is discussed.

      The single connector for 2 SMP processor upgrade cards consists
of a single mounting footprint to the motherboard and 2 "edge
connector slots" in which 2 processors can be plugged in (Figure).
The reason this connector is so feasible is due to the fact that
multiprocessors share many common signals.  Only a few signals are
required to be unique.  Thus, the number of pins on the unified
connector would only be increased by the number of unique pins from
the second processor.

      The edge connector slots would be mounted on the base of the
connector in such a way as to be angled away from each other at a 45
degree angle.  The purpose of the 45 degree angle is to allow spacing
for heatsinks that reside on the processor modules.  The close
proximity of the two CPU cards makes it easier to place the two CPU
cards directly in front of the cooling fan.

      The length of the common pins between the two CPU connectors
would be kept as short as possible to minimize the effects of T's and
stubs.  This would make a significant improvement in the signal
quality as well as adding additional margins to timing constraints.

      The reliability...