Logical PHY Interface Adapter for Multi-Protocol Die-to-Die Links
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Solution Overview
Problem
Existing interconnect architectures in computing systems face challenges in efficiently managing high bandwidth and power consumption demands as computing systems become more complex, with varying market segments requiring different performance and power trade-offs.
Innovation Solution
The implementation of a generic logical PHY interface adapter that abstracts handshakes for initialization, power management, and link training across different protocols, enabling efficient die-to-die communication in multi-chip packaging, and supports multiple protocols like PCIe and CXL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing interconnect architectures are used to handle high bandwidth demands, then communication capability is improved, but power consumption increases
Solution Approach 1:
The adapter implements a universal interface that supports multiple interconnect protocols (PCIe, CXL, and future protocols) through a common logical PHY interface. This multi-functionality allows the same hardware infrastructure to serve different protocol requirements, reducing the need for separate dedicated interfaces for each protocol and thereby lowering overall power consumption while maintaining high bandwidth capabilities across different communication scenarios.
Solution Approach 2:
The logical PHY adapter acts as an intermediary layer between the link layer controller and the physical layer interface. It abstracts and standardizes the interface requirements, enabling protocol-agnostic communication while optimizing power management. The adapter mediates between different protocol requirements and the underlying physical interface, allowing for efficient power-state transitions and reduced power consumption during idle and low-activity states.
2Adaptability or versatility
If multiple protocols are supported to meet varying market segment needs, then adaptability is improved, but device complexity increases
Solution Approach 1:
The adapter implements a universal interface that supports multiple interconnect protocols (PCIe, CXL, and future protocols) through a common logical PHY interface. This multi-functionality allows the same hardware infrastructure to serve different protocol requirements, reducing the need for separate dedicated interfaces for each protocol and thereby simplifying the overall device architecture while maintaining high adaptability.
Solution Approach 2:
The adapter employs dynamic protocol selection and configuration capabilities, allowing the system to adaptively choose the appropriate protocol based on the connected device and operational requirements. The interface can dynamically reconfigure its parameters and behavior to match the active protocol, eliminating the need for multiple static interface configurations and reducing device complexity.
3Adaptability or versatility
If handshakes for initialization, power management, and link training are implemented for each protocol, then protocol compatibility is improved, but latency increases
Solution Approach 1:
The adapter performs preliminary configuration and state setup in advance, maintaining pre-configured parameter sets for multiple protocols. During protocol transitions, it can quickly switch between pre-configured states rather than performing complete re-initialization, significantly reducing initialization latency while maintaining full protocol compatibility through the standardized logical PHY interface.
Solution Approach 2:
The logical PHY adapter acts as an intermediary that standardizes handshake sequences and state transitions across different protocols. It provides a unified control mechanism that manages initialization, power management, and link training handshakes in a protocol-agnostic manner, reducing the need for multiple separate handshake implementations and thereby lowering overall latency.
4Productivity
If die-to-die communication is enabled in multi-chip packaging, then bandwidth is improved, but power consumption increases
Solution Approach 1:
The adapter serves as an intermediary interface layer that enables efficient die-to-die communication through standardized logical PHY protocols. It optimizes power management for high-speed serial interfaces by implementing intelligent power-state transitions and voltage scaling, allowing the system to achieve high die-to-die bandwidth when needed while minimizing power consumption during lower-activity periods.
Solution Approach 2:
The adapter dynamically adjusts operational parameters such as data rate, voltage levels, and signal swing amplitude based on communication requirements and power constraints. For die-to-die communication, it can optimize these parameters to achieve maximum bandwidth efficiency while minimizing power consumption, adapting the interface characteristics to match the specific electrical and timing requirements of different die-to-die link scenarios.
Data Source
AI summary
An adapter is provided that includes a first interface to couple to a particular device, where link layer data is to be communicated over the first interface, and a second interface to couple to a physical layer (PHY) device. The PHY device includes wires to implement a physical layer of a link, and the link couples the adapter to another adapter via the PHY device. The second interface includes a data channel to communicate the link layer data over the physical layer, and a sideband channel to communicate sideband messages between the adapter and the other adapter over the physical layer. The adapter is to implement a logical PHY for the link.