PCIe Link Parity Signaling Before Active-State Exit
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Solution Overview
Problem
As computing systems become more complex, existing interconnect architectures face challenges in meeting bandwidth requirements and power efficiency, particularly in high-performance computing environments where longer interconnect channels are needed without compromising performance or increasing power consumption.
Innovation Solution
The implementation of a PCIe 4.0 interconnect architecture with a two-connector channel configuration that exceeds 12 inches in length, utilizing backdrilled vias and low-loss circuit board designs to minimize signal degradation and power consumption, while applying gain at the receiver front end and continuous time linear equalizer to maintain high data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traditional interconnect architectures are used, then bandwidth requirements are met for short channels, but performance degrades and power consumption increases for channels exceeding 12 inches
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional electrical signaling to optical signaling, fundamentally changing the transmission medium's properties. This enables reliable transmission over channels exceeding 12 inches by utilizing optical properties that are less susceptible to signal degradation, impedance mismatches, and interference that plague electrical interconnects at such lengths.
Solution Approach 2:
The patent substitutes electrical mechanical systems with optical systems. By replacing electrical signals with optical signals, the system eliminates the harmful effects of electrical resistance, capacitance, and inductance that cause signal degradation in long channels. The optical interconnect architecture replaces the traditional electrical bus structure with a fundamentally different physical mechanism.
2Productivity
If traditional interconnect architectures are used, then electrical communications are handled, but bandwidth requirements and power efficiency are not met for high-performance computing environments
Solution Approach 1:
The patent changes the fundamental transmission parameter from electrical to optical domain. Optical signals can carry higher bandwidth information at lower power consumption compared to electrical signals, especially over long distances. This parameter change enables the system to meet the high bandwidth requirements of modern computing while reducing power consumption.
Solution Approach 2:
The patent replaces the electrical communication mechanism with an optical communication mechanism. This substitution eliminates the need for electrical signal amplification and regeneration that consumes significant power in traditional electrical interconnects, thereby improving power efficiency while increasing bandwidth capacity.
3Reliability
If connector stub effects are present, then signal degradation occurs, but adding repeater chips increases device complexity and manufacturing costs
Solution Approach 1:
The patent replaces the electrical connector system with an optical connector system. Optical connectors are inherently more tolerant of stub effects and signal reflections because optical signals do not suffer from the same electrical interference and impedance issues. This substitution eliminates the need for repeater chips and complex signal conditioning circuitry, thereby reducing device complexity while maintaining or improving signal transmission quality.
Data Source
AI summary
An identification is made that a link is to exit an active state, the link comprising a plurality of lanes. Parity information is maintained for the lanes based on data previously sent over the link, and an indication of the parity information is sent prior to the exit from the active state.