Variable Vddq DIMM Voltage Control for Power Efficiency
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Solution Overview
Problem
Information handling systems face challenges in efficiently managing varying data bus input/output voltage (Vddq) across different dual in-line memory modules (DIMMs), leading to suboptimal signal acquisition and increased power consumption due to fixed voltage settings despite varying connection lengths and manufacturer differences.
Innovation Solution
Implementing a dual in-line memory module (DIMM) controller with a basic input/output system (BIOS) that configures unique data bus input/output voltage settings for each DIMM based on trace length and equalization settings, using separate voltage regulators or power management integrated circuits to optimize Vddq for bidirectional communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed voltage settings are used for all DIMMs, then device complexity is reduced, but power efficiency deteriorates due to inability to optimize Vddq for different connection lengths and manufacturers
Solution Approach 1:
The patent implements per-DIMM voltage control where each DIMM can have its own optimized Vddq setting based on its specific characteristics (connection length, manufacturer, equalization settings). This allows local optimization of power consumption for each memory module while maintaining overall system efficiency, directly resolving the contradiction between simplified fixed-voltage control and power efficiency.
Solution Approach 2:
The system dynamically adjusts Vddq voltage settings based on detected DIMM characteristics such as trace length, equalization requirements, and manufacturer-specific parameters. This dynamic adaptation enables the system to optimize power consumption in real-time while maintaining signal integrity, addressing the power efficiency issue without requiring complex manual configuration.
2Use of energy by moving object
If per-DIMM voltage optimization is implemented, then power efficiency improves, but device complexity increases due to need for separate voltage regulators or PMICs
Solution Approach 1:
The patent employs a universal voltage control mechanism where a single controller (DIMM controller or BIOS) manages voltage settings for multiple DIMMs through a standardized interface. This multi-functional approach allows per-DIMM optimization without requiring completely separate control circuits for each module, thereby limiting the increase in device complexity while achieving power efficiency gains.
Solution Approach 2:
The system introduces an intermediary voltage regulation layer (separate voltage regulators or PMICs) that sits between the power source and DIMMs, managing voltage distribution centrally. This intermediary structure simplifies the overall architecture by consolidating control functions while still enabling individual DIMM optimization, thus improving power efficiency without proportionally increasing complexity.
3Reliability
If higher Vddq is supplied to all DIMMs, then signal acquisition is improved, but power consumption increases
Solution Approach 1:
The patent changes the voltage parameter (Vddq) on a per-DIMM basis according to specific requirements determined by trace length, equalization settings, and manufacturer characteristics. Instead of uniformly increasing voltage for all DIMMs, the system selectively adjusts voltage only where needed to achieve reliable signal acquisition, thereby minimizing energy loss while maintaining signal integrity.
Solution Approach 2:
The system applies voltage optimization partially - only to the extent necessary for each specific DIMM's signal acquisition needs. By avoiding excessive voltage application to all DIMMs uniformly, the system achieves reliable communication where required while conserving power in cases where lower voltage suffices, thus balancing reliability and energy consumption.
Data Source
AI summary
An information handling system includes a control processing unit (CPU) including a dual in-line memory module (DIMM) controller and hosting a basic input output system (BIOS). A first and a second set of DIMMs are connected to the CPU through the DIMM controller and by a first communication channel and a second communication channel, respectively. Each DIMM in the first and second set of DIMMs may be configured by the BIOS to include a unique data bus IO voltage (Vddq) setting for bidirectional communications with the CPU.