Proximity Interconnect Off-Chip Cache Architecture
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Solution Overview
Problem
Conventional cache architectures face limitations in bandwidth and latency due to reliance on low-bandwidth physical interconnects, leading to inefficiencies in data access and cache coherence protocols, especially in systems with multiple processors and off-chip cache memories.
Innovation Solution
Implementing a proximity communication-based off-chip cache memory architecture that uses capacitive coupling for high-bandwidth data transfer between integrated circuits, allowing processors to connect directly with multiple off-chip cache memories through a proximity interconnect module, thereby creating a distributed and shared cache memory system with optimized latency and coherence protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional physical interconnects are used to connect off-chip cache memories, then device complexity is reduced and ease of manufacture is improved, but bandwidth is limited and latency increases
Solution Approach 1:
The patent replaces conventional mechanical/physical interconnect structures with electromagnetic field-based proximity communication. Integrated circuits communicate through capacitive coupling in close proximity without direct physical contact, substituting the mechanical connection system with an electromagnetic field system to achieve higher bandwidth and lower latency while maintaining manufacturing simplicity
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary medium between integrated circuits. Instead of direct physical connections, data is transmitted through electromagnetic fields generated by transmitting circuits and detected by receiving circuits in proximity, enabling high-speed communication without complex physical interconnect structures
2Quantity of substance
If more off-chip cache memories are added to increase cache size, then cache capacity is improved, but bandwidth per cache and access latency worsen due to physical interconnect limitations
Solution Approach 1:
The patent segments the cache memory system into multiple independent off-chip cache memories that can be distributed across different integrated circuits. Each cache memory operates independently and can be accessed simultaneously through proximity communication, enabling scalable capacity expansion without compromising access speed due to the high bandwidth of electromagnetic field-based interconnects
Solution Approach 2:
The patent transitions from a single-dimension physical interconnect architecture to a multi-dimensional proximity communication architecture. Multiple integrated circuits with off-chip cache memories can communicate in parallel through electromagnetic fields in three-dimensional space, enabling exponential scaling of cache capacity while maintaining linear or better access performance
3Productivity
If conventional cache protocols are used over physical interconnects, then protocol simplicity is maintained, but cache coherence efficiency deteriorates due to bandwidth limitations
Solution Approach 1:
The patent enables continuous high-bandwidth communication between cache memories through proximity communication, eliminating the bandwidth bottlenecks that force protocol simplifications. The electromagnetic field-based interconnect maintains continuous, high-speed data flow, allowing complex cache coherence protocols to execute efficiently without being constrained by physical interconnect bandwidth limitations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances bandwidth and reduces latency, improving cache performance and system throughput by enabling faster and more efficient data access and cache coherence, while allowing for a larger, shared off-chip cache memory across multiple processors.
Implementation Method 1
uses capacitive coupling for high-bandwidth data transfer between integrated circuits
Data Source
AI summary
A proximity interconnect module includes a plurality of processors operatively connected to a plurality of off-chip cache memories by proximity communication. Due to the high bandwidth capability of proximity interconnect, enhancements to the cache protocol to improve latency may be made despite resulting increased bandwidth consumption.