Memory Controller Equalizer for Signal Quality Enhancement
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Solution Overview
Problem
As the number of Dual In-Line Memory Modules (DIMMs) in computer memory subsystems increases, signal distortions along the memory bus grow due to increased memory bus load, causing a reduction in operational speed.
Innovation Solution
A memory controller with a reception buffer, equalizer, and logic that stores and processes reception and transmission characteristics for each memory module, equalizing and pre-emphasizing signals to minimize distortions and enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of DIMMs in a computer memory subsystem increases, then the memory capacity increases, but the operational speed decreases due to signal distortions
Solution Approach 1:
An equalizer is introduced as an intermediary component in the memory controller to compensate for signal distortions caused by increased memory bus load. The equalizer adjusts signal characteristics to counteract reflections and inter-symbol interference, enabling high-speed operation even with multiple DIMMs connected
Solution Approach 2:
The system dynamically changes signal parameters (equalization settings) based on the detected memory bus load and signal quality. By adjusting equalization parameters in response to varying conditions, the system maintains optimal signal integrity across different DIMM configurations
2Adaptability or versatility
If the number of DIMMs increases, then more memory modules can be connected, but signal reflections and inter symbol interference increase
Solution Approach 1:
The memory controller monitors signal quality and bus load conditions, then uses this feedback to adjust equalization parameters. This closed-loop approach allows the system to adapt to different numbers of DIMMs and maintain signal quality by compensating for harmful effects in real-time
Solution Approach 2:
The equalizer acts as a mediator between the memory bus and the memory controller logic, filtering and conditioning signals to reduce the impact of reflections and inter-symbol interference before they reach the processing logic
Data Source
AI summary
Computer memory subsystems are disclosed for enhancing signal quality that include: one or more memory modules; a memory bus; and a memory controller connected to the memory modules through the memory bus, the memory controller including a reception buffer connected to the memory bus, the reception buffer capable of receiving an input signal from one of the memory modules, the memory controller including a reception characteristics table capable of storing reception characteristics for each of the memory modules connected to the memory controller, the memory controller including an equalizer connected to the reception buffer and the reception characteristics table, the equalizer capable of equalizing the received input signal in dependence upon the reception characteristics for the memory module from which the input signal was received, and the memory controller including memory controller logic connected to the equalizer, the memory controller logic capable of processing the equalized input signal.