Discussion Overview
The discussion revolves around interfacing two processing boards using PCI Express x8 connections via cables. Participants are exploring the compatibility of different connector types, specifically a 68-pin off-board connector versus a 98-pin edge connector, and the associated technical challenges such as impedance control and signal integrity.
Discussion Character
- Technical explanation
- Debate/contested
- Experimental/applied
Main Points Raised
- One participant seeks guidance on how to match the 98-pin edge connector to the 68-pin off-board connector and questions the standardization of the 68-pin connector.
- Another participant inquires about the availability of application notes from Molex regarding the 68-pin connector.
- Concerns are raised about the length of the cables and the implications for impedance control, terminations, and signal integrity.
- A participant notes the existence of a pinout description on Molex's website for cable assemblies and mentions that impedance control information is primarily available for edge connectors.
- There is a reference to the PCI Express External Cabling specification, which is noted to be incomplete in its draft form.
- Another participant expresses interest in the outcome of similar attempts to interface the boards, indicating a shared challenge.
Areas of Agreement / Disagreement
Participants appear to share common challenges regarding the technical aspects of the PCI Express connection, but there is no consensus on the specifics of the connector standardization or the completeness of available documentation.
Contextual Notes
Limitations include the lack of comprehensive information on the 68-pin connector's standardization and the incomplete draft of the PCI Express External Cabling specification, which may affect the discussion on impedance control and signal integrity.
Who May Find This Useful
Individuals working on hardware interfacing, particularly those involved in PCI Express implementations and cable assembly design, may find this discussion relevant.