Ground-Referenced PCB Signaling for Hardware Memory Coherence
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Solution Overview
Problem
Conventional communication systems face inefficiencies due to software-managed memory coherence protocols, increased power consumption, and reduced bandwidth caused by differential signaling and encoding schemes, leading to performance limitations in high-speed data transmission.
Innovation Solution
Implementing a ground referenced signaling (GRS) link between devices that uses a similar current for different logic states, eliminating the need for differential signaling and encoding, thereby reducing noise and optimizing bandwidth and area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If differential signaling is used for high-speed communication, then noise immunity is improved, but bandwidth and physical space are reduced
Solution Approach 1:
The patent transitions from differential signaling parameters to ground-referenced signaling parameters, changing the fundamental electrical reference from a differential pair to a ground reference. This parameter change enables single-ended signaling that consumes less physical space while maintaining noise immunity through controlled impedance and proper grounding techniques.
Solution Approach 2:
The patent extracts the differential signaling requirement by implementing ground-referenced signaling instead. By removing the need for paired differential traces and encoding schemes, the system achieves higher bandwidth and reduced physical space while maintaining reliability through alternative noise rejection methods.
2Reliability
If encoding schemes are used for communication, then noise immunity is improved, but power consumption increases and bandwidth decreases
Solution Approach 1:
The patent changes the signaling parameter from encoded differential signaling to ground-referenced single-ended signaling. This eliminates the need for complex encoding/decoding operations, thereby reducing power consumption while maintaining noise immunity through proper ground referencing and controlled impedance design.
3Adaptability or versatility
If software manages memory coherence protocols, then system flexibility is improved, but performance and latency are reduced
Solution Approach 1:
The patent replaces software-based memory coherence management with hardware-based signaling and control mechanisms. By implementing ground-referenced signaling with dedicated control lanes for coherence protocols, the system achieves hardware-level performance and latency reduction while maintaining the flexibility of memory coherence management through configurable hardware logic.
4Productivity
If additional data lanes are added to increase bandwidth, then communication capacity is improved, but physical space increases
Solution Approach 1:
The patent changes the signaling approach from differential pairs requiring extensive physical space to ground-referenced single-ended signaling that achieves higher bandwidth density. By using ground as the reference instead of requiring paired traces, the system can pack more data lanes into the same physical footprint, achieving higher capacity without proportionally increasing physical space.
Data Source
AI summary
A system includes a first integrated circuit coupled to a printed circuit board (PCB) and a second integrated circuit coupled to the PCB. The system further includes a ground referenced signaling (GRS) link coupled between the first integrated circuit and the second integrated circuits through the PCB. Unencoded data is transmitted on the GRS link according to a memory coherence protocol.