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Method for a multi-mode/multi-slot PCI/PCI-X hot-plug at 800-mils pitch

IP.com Disclosure Number: IPCOM000012780D
Publication Date: 2003-May-28
Document File: 2 page(s) / 139K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a multi-mode/multi-slot PCI/PCI-X hot-plug at 800-mils pitch. Benefits include improved functionality and improved support for future technology.

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Method for a multi-mode/multi-slot PCI/PCI-X hot-plug at 800-mils pitch                        � � � � � � � � � � � � � � � � � � � � � � � � �         � � � �

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Disclosed is a method for a multi-mode/multi-slot PCI/PCI-X hot-plug at 800-mils pitch. Benefits include improved functionality and improved support for future technology.

Background

        � � � � � Conventionally, a PCI/PCI-X hot-plug design with multi-node/multi-slots bus has been achieved with a PCI/PCI-X connector center-to-center spacing of >= 960 mils (0.96 inch). In server platforms not supporting a PCI/PCI-X hot-plug, connector center-to-center spacing is typically 800 mils. Achieving the same spacing is not possible if hot-plug is supported on multiple slots on a PCI/PCI-X bus. Hot-plug support requires bus isolation circuitry (transmission gates), power isolation circuitry, plus a hot-plug controller. Additionally, a large portion of the circuitry must be placed between the PCI/PCI-X connectors. The spacing between the connector must be increased to >=960 mils to accommodate the required circuitry.

        � � � � � Conventional PCI/PCI-X bridge controller devices require external termination on the upper 32-bit address/data bus and PCI/PCI-X control signals. Typically, these terminations (pull-ups) are placed between the PCI/PCI-X connectors on the motherboard.

        � � � � � Conventionally, platforms supporting hot-plug use 20-bit bus-switches for bus isolation logic that are bigger in size and cannot be accommodated with 800-mils center-to-center spacing between connectors. (A 20-bit bus switch is an example of a bus isolation component with 20 transmission gates, which are typically used for hot-plug.) Ten-bit bus switches are smaller in physical size. Ten-bit bus switches required for bus isolation logic can be accommodated within the 800-mils center-to-center spacing between connectors. The overall silicon surface area required (in sq...