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Identification of Mis-stuffed Lane Reversed vs. Non-Lane Reversed Cards

IP.com Disclosure Number: IPCOM000029132D
Publication Date: 2004-Jun-16
Document File: 3 page(s) / 341K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that enables a x16 connector to be rotated 180 degrees from a traditional ATX, without forcing "bow tying" on the PCI Express bus. Benefits include helping support technicians more quickly diagnose problems.

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Identification of Mis-stuffed Lane Reversed vs. Non-Lane Reversed Cards

Disclosed is a method that enables a x16 connector to be rotated 180 degrees from a traditional ATX, without forcing “bow tying” on the PCI Express bus. Benefits include helping support technicians more quickly diagnose problems.

Background

Intel has developed the Serial Digital Video Output (SDVO) bus to provide low-cost digital display solutions. The SDVO bus is multiplexed on the PCI Express signals that are connected to the Graphics Memory Controller Hub (GMCH). Advanced Digital Display 2 (ADD2) cards have been developed to gain access to the SDVO signals in a system using a x16 PCI Express connector.

General Description

In the disclosed method, the PCI Express enables the entire link to be “swizzled” (i.e. lane 15 on a GMCH connects to lane 0 on a x16 connector, lane 14 to lane 1, etc.).  An example of this is in BTX (Balance Technology Extended) systems, which allow for a x16 connector to be rotated 180 degrees from a traditional ATX and not force “bow tying” on the PCI Express bus (see Figures 1 and 2).  A GMCH may support this static lane reversal on the PCI Express, yet at the same time it may or may not support lane reversal for SDVO.

A GMCH that supports lane reversal is used in both ATX and BTX style systems. If this GMCH supports PCI Express lane reversal and not SDVO lane reversal, two SKUs of ADD2 cards must be developed to gain access to the SDVO bus.  The first SKU is the ADD2-N (normal) card, which works on systems with a normal PCI-Express layout (i.e. ATX systems).  The second SKU is the ADD2-R (reversed) card, which works on systems with the PCI-Express lanes reversed.

If an ADD2 card meant for an ATX system is plugged into a BTX...