Bus-Powered Module Control for Current Capacity and Voltage Matching
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Solution Overview
Problem
Computer systems face issues with excessive heat and reliability due to non-compliant add-in modules exceeding current capacity thresholds and voltage mismatch in sideband signaling, leading to electrical stress.
Innovation Solution
Implementing a mechanism to limit electric current consumption by detecting threshold current capacity and adjusting operational modes of modules, and ensuring voltage levels match between modules and hosts through utilization monitoring and power estimating circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If add-in modules operate at high current capacity, then functionality and performance are improved, but excessive heat and reliability issues occur when current exceeds threshold
Solution Approach 1:
The host system detects the sideband signaling voltage level produced by the add-in module and uses this feedback to determine the module's current capacity threshold. Based on this detected threshold, the host dynamically adjusts its current allocation to the module, preventing excessive current draw that would cause heat and reliability issues while allowing maximum performance within safe limits.
Solution Approach 2:
The system changes the electrical parameter (current capacity threshold) dynamically based on the detected sideband signaling voltage level. By monitoring voltage changes on shared bus lines, the system identifies the module's current threshold and adjusts operating parameters accordingly, enabling adaptive performance management that prevents overheating and reliability failures.
2Adaptability or versatility
If add-in modules use different voltage levels for sideband signaling, then manufacturing flexibility and adaptability are improved, but voltage mismatch causes electrical stress and compatibility issues
Solution Approach 1:
The host system actively detects the sideband signaling voltage level produced by the add-in module during initialization or operation. This feedback mechanism identifies the module's voltage domain (e.g., 1.2V, 1.8V, 3.3V) and enables the host to adjust its signaling accordingly, ensuring voltage compatibility and preventing electrical stress while maintaining support for diverse module types with different voltage requirements.
3Use of energy by moving object
If the host allocates high current to modules, then power availability and performance are improved, but current capacity threshold violations cause heat and reliability problems
Solution Approach 1:
The system dynamically changes the current allocation parameter based on the detected sideband signaling voltage level, which reveals the module's current capacity threshold. By adjusting the current threshold parameter adaptively rather than using a fixed high allocation, the system ensures adequate power availability for legitimate high-performance needs while preventing current exceedance that would generate excessive heat and compromise reliability.
Data Source
AI summary
An apparatus comprises a circuit board comprising a connector in or on the circuit board. The apparatus is to be coupled to a bus via the connector. The apparatus comprises first circuitry to communicate with a processor via the connector and bus, second circuitry to detect a utilization state of the first circuitry, determine, based on the detected utilization state of the first circuitry, a level of current to be conducted with the connector; and generate a signal indicating of whether the level of current exceeds a threshold current capacity of the connector, and third circuitry to select a first operational mode from among multiple operational modes. The first circuitry is to operate in any of the multiple operational modes responsive to the third circuitry. Additional circuitry may be provided to identify a voltage level capability of the apparatus and to configure voltage level shifting circuitry connected to the bus.