Off-module Data Buffer for Modular Memory Signal Integrity
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Solution Overview
Problem
Conventional memory systems face challenges in achieving high end-to-end data rates and signal integrity due to multi-drop topologies, which result in signal reflections and reduced signaling rates.
Innovation Solution
The implementation of modular memory systems with off-module data buffers that split data paths between a memory control component and memory-module sockets, using point-to-point connections to improve signal integrity and enable higher data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multi-drop topology is used to connect memory control component to multiple memory modules, then device complexity is reduced and ease of manufacture is improved, but signal integrity deteriorates due to signal reflections and signaling rate is reduced
Solution Approach 1:
The patent divides the memory system into modular components with dedicated data buffers at each memory module. Each buffer segments the data path, isolating signal reflections to local segments rather than allowing them to propagate through the entire multi-drop topology. This segmentation maintains signal integrity while preserving the manufacturing simplicity of modular memory modules.
Solution Approach 2:
Data buffers are introduced as intermediary components between the memory control component and memory modules. These buffers act as mediators that receive data from the control component, buffer it temporarily, and then forward it to the appropriate memory module. This intermediary approach eliminates direct multi-drop signal paths, reducing reflections while maintaining system manufacturability.
2Device complexity
If multi-drop topology is used to connect memory control component to multiple memory modules, then device complexity is reduced, but end-to-end data rate is reduced due to signal reflections
Solution Approach 1:
By segmenting the data path with local buffers at each memory module, the patent eliminates the need for complex signal equalization and timing recovery circuits that would be required in a direct multi-drop high-speed interface. Each segment operates independently at lower speeds, achieving high aggregate throughput while keeping individual component complexity low.
Solution Approach 2:
The data buffer serves as an intermediary that converts the multi-drop control interface into multiple point-to-point data interfaces. This allows the memory control component to communicate with multiple modules simultaneously through buffered channels, increasing end-to-end data rate without requiring complex multi-drop high-speed signaling.
3Reliability
If point-to-point connections with off-module data buffers are implemented, then signal integrity is improved and end-to-end data rate is increased, but device complexity increases
Solution Approach 1:
Each memory module includes its own data buffer that performs local data handling, buffering, and forwarding operations. This self-service approach eliminates the need for complex centralized control logic in the memory control component, as each module independently manages its own data path. The complexity is distributed and standardized across modules, making the overall system manageable despite the point-to-point architecture.
4Productivity
If point-to-point connections with off-module data buffers are implemented, then end-to-end data rate is increased, but manufacturing cost increases
Solution Approach 1:
The patent uses relatively simple, standardized data buffer components that can be manufactured at low cost using conventional semiconductor processes. These buffers are designed as cost-effective, high-volume components rather than complex custom circuits. The modular design allows for economical production and replacement, achieving high data rates without prohibitively expensive custom hardware.
Data Source
AI summary
In a modular memory system, a memory control component, first and second memory sockets and data buffer components are all mounted to the printed circuit board. The first and second memory sockets have electrical contacts to electrically engage counterpart electrical contacts of memory modules to be inserted therein, and each of the data buffer components includes a primary data interface electrically coupled to the memory control component, and first and second secondary data interfaces electrically coupled to subsets of the electrical contacts within the first and second memory sockets, respectively.