Load-Reducing Memory Module With Switching Circuit
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Solution Overview
Problem
Current memory subsystems face limitations in memory density and speed due to physical constraints and increased power dissipation when trying to expand addressable memory space, leading to slower system performance and hardware modifications to maintain signal integrity.
Innovation Solution
A load-reducing memory module with a switching circuit that isolates memory devices from the system memory controller, allowing simultaneous access to multiple ranks as a single logical rank, reducing the load on the controller and enhancing signal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of memory devices is increased to provide higher density, then memory capacity increases, but power dissipation increases and operational speed decreases
Solution Approach 1:
The patent segments the memory module into multiple independent ranks, each with its own buffer and control logic. This segmentation allows selective activation of individual ranks, reducing the total power consumption when not all memory devices need to be accessed simultaneously, while still providing high total capacity through the combined ranks.
2Quantity of substance
If the number of memory devices is increased to provide higher density, then memory capacity increases, but operational speed decreases
Solution Approach 1:
The patent divides the memory module into multiple ranks that can be accessed independently and simultaneously. Each rank has dedicated data paths and control buffers, enabling parallel memory operations that maintain high operational speed even as total memory capacity increases through additional devices.
Solution Approach 2:
The patent introduces a new dimension of parallelism by organizing memory devices into multiple ranks that operate concurrently. This dimensional expansion from sequential to parallel access allows the system to maintain high speed while scaling capacity, as multiple memory operations can proceed simultaneously across different ranks.
3Quantity of substance
If more memory devices are added to increase capacity, then memory density increases, but thermal dissipation increases
Solution Approach 1:
The patent segments the memory module into multiple ranks with independent control, allowing selective activation of only the necessary ranks for each operation. This reduces the overall thermal load by keeping inactive ranks in a lower-power state, thereby managing thermal dissipation while maintaining high memory density through the combined capacity of all ranks.
4Quantity of substance
If the number of memory devices is increased, then addressable memory space increases, but the load on the system controller increases resulting in slower system performance
Solution Approach 1:
The patent introduces buffers as intermediary components between the system controller and memory devices in each rank. These buffers absorb and manage the increased load from additional memory devices, decoupling the controller from the full burden of high-density memory access and maintaining system performance while enabling expanded addressable memory space.
Data Source
AI summary
A load-reducing memory module includes a plurality of memory components such as DRAMs. The memory components are organized into sets or ranks such that they can be accessed simultaneously for the full data bit-width of the memory module. A plurality of load reducing switching circuits is used to drive data bits from a memory controller to the plurality of memory components. The load reducing switching circuits are also used to multiplex the data lines from the memory components and drive the data bits to the memory controller.