Daughter Card Plug Detection via Ground Pin Signal Path
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Solution Overview
Problem
In large server boards with many connectors, such as a 4 socket CPU motherboard with up to 64 DIMM connectors, existing systems lack a separate plug detect signal, requiring devices to be powered on for plug detection, which is inefficient and can lead to mis-assembly issues before the server is connected in a data center rack.
Innovation Solution
The implementation of a low-power connection using existing ground pins for plug detection, allowing for the verification of proper interconnection without powering the devices fully, utilizing high-pass filters and capacitors to establish a low-bandwidth signal path for plug detection, and minimizing the number of reference connections adjacent to signal connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate plug detect signal is used, then plug detection can be performed, but the device complexity increases and more reference connections are needed adjacent to signal connections
Solution Approach 1:
Existing ground pins that were previously used only for grounding are made to serve dual purposes: both as ground references and as plug detection signal paths. This eliminates the need for separate dedicated plug detect pins and reduces overall connector complexity while maintaining reliable plug detection capability
Solution Approach 2:
The plug detection function is merged with the existing ground reference infrastructure. By combining the ground pin functionality with plug detection signaling, the patent reduces the total number of required connections and simplifies the connector design without sacrificing detection reliability
2Reliability
If devices are powered on for plug detection, then plug detection can be performed, but energy consumption increases
Solution Approach 1:
The ground pins and existing reference voltage infrastructure serve themselves to provide plug detection functionality without requiring additional power sources. The system uses its own existing electrical infrastructure (ground pins and reference voltages) to perform detection, eliminating the need for separate power consumption during the detection process
Solution Approach 2:
Existing ground pins are made multi-functional to perform both grounding and plug detection without requiring additional power. The same electrical infrastructure that exists for normal operation is leveraged to provide detection capability, avoiding extra energy consumption
3Reliability
If more reference connections are placed adjacent to signal connections, then plug detection is improved, but crosstalk and interference with data signals increase
Solution Approach 1:
The plug detection function is extracted from the signal-carrying pins and implemented through dedicated ground pins. This separation ensures that detection signals do not interfere with data signals, as the ground pins are specifically designed for reference and detection purposes rather than high-speed data transmission
Solution Approach 2:
Different pin types are assigned different functions based on their electrical characteristics: ground pins are used for plug detection due to their stable reference properties, while signal pins are reserved for data transmission. This local optimization of pin functionality minimizes interference between detection and data signals
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables plug detection without powering the connectors, ensuring proper assembly before system deployment, reducing the risk of mis-assembly and operational issues, while maintaining a low-impact on data signal integrity and minimizing crosstalk.
Implementation Method 1
utilizing high-pass filters and capacitors to establish a low-bandwidth signal path for plug detection
Implementation Method 2
utilizing high-pass filters and capacitors to establish a low-bandwidth signal path for plug detection
Data Source
AI summary
A structure is provided for a structure for providing electrical connections across a connection interface is provided. The structure may include one or more signal connections, a plurality of reference connections, and one or more high-pass filters. One or more of the reference connections is configured to connect a first reference voltage in a first region on a first side of the interface with a second reference voltage in a second region on a second side of the interface. One or more of the reference connections in a first class of reference connections is coupled one or more of the reference voltages through the one or more high-pass filters, and low-bandwidth information is communicated across the one or more reference connections in the first class of reference connection.