Browse Prior Art Database

Partitioning of I/O Circuits with Flex Cable and Connector Panel

IP.com Disclosure Number: IPCOM000104511D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 1 page(s) / 59K

Publishing Venue

IBM

Related People

Huynh, DQ: AUTHOR [+2]

Abstract

Disclosed is the modular partitioning of circuits in a computer system so that all I/O supporting functions, except for drivers and electromagnetic interference (EMI) suppressors, are integrated into an I/O functional island card connected to the planar board. All external I/O connectors are mouned on a connector panel, with signals being bussed through a flex cable between the functional island card and the connector panel.

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This is the abbreviated version, containing approximately 86% of the total text.

Partitioning of I/O Circuits with Flex Cable and Connector Panel

      Disclosed is the modular partitioning of circuits in a computer
system so that all I/O supporting functions, except for drivers and
electromagnetic interference (EMI) suppressors, are integrated into
an I/O functional island card connected to the planar board.  All
external I/O connectors are mouned on a connector panel, with signals
being bussed through a flex cable between the functional island card
and the connector panel.

      As shown in the figure, I/O functional island card 1, including
various I/O supporting logic circuits 2, is connected to planar board
3 by means of a high-density connector 4.  Connection pads of card 1
may alternately be soldered to corresponding pads on board 3.
External I/O connectors 5 are mounted on connector panel 6.  Signal
traces 7 extend to panel 6 from high-density connector 4 by means of
a flex cable 8, to which drivers 9 and EMI suppressors 10, such as
toroids, ferrite beads, and decoupling capacitors, are placed.
Connector panel 6 includes either a stiffened piece of flex cable to
which external I/O connectors 5 are attached, or a separate circuit
board attached to for this purpose.  A quiet electrical ground is
established at connector panel 6, being separated from the system
digital ground of planar board 3 by a zone of separation 11 extending
across flex cable 8.  External devices (not shown) are connected to
the system by means of external cables...