PHY Recalibration via Message Bus Interface for Pin Count Reduction
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Solution Overview
Problem
Current interconnect architectures, such as PCIe, face challenges in scalability and signal count management, particularly with the increasing complexity of computing systems, leading to issues with power consumption and performance optimization across various market segments.
Innovation Solution
The implementation of a message bus interface within the PHY/MAC interface, which maps control and status signals to registers instead of dedicated pins, reducing the pin count and enabling more efficient communication and recalibration processes while maintaining backward compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated pins are used for control and status signals in PHY/MAC interface, then signal transmission reliability is improved, but device complexity and pin count increase
Solution Approach 1:
The patent merges multiple control and status signals into a single message bus interface. Instead of using separate dedicated pins for each control and status signal, the invention combines these signals into a unified message bus that operates between the PHY and MAC layers, thereby reducing pin count while maintaining signal transmission reliability through structured message protocols.
Solution Approach 2:
The message bus interface serves multiple functions simultaneously - it handles control signals, status signals, and data communication between PHY and MAC layers. This multi-functional approach replaces multiple dedicated signal paths with a single universal interface, reducing device complexity while preserving all necessary communication capabilities.
2Adaptability or versatility
If more control signals are added to support advanced features, then adaptability is improved, but device complexity increases
Solution Approach 1:
The message bus interface is designed as a universal communication channel that can accommodate various control and status signals for different advanced features. Rather than adding dedicated pins for each feature, the message bus provides a flexible framework that can carry multiple types of control messages, status updates, and configuration data through a single multi-functional interface.
Solution Approach 2:
The message bus interface enables dynamic configuration and control of PHY operations. Control messages can be dynamically generated and transmitted through the message bus to adapt the interface behavior based on system requirements, allowing advanced features to be enabled or disabled without adding permanent dedicated signal paths for each possible feature.
3Ease of manufacture
If traditional multi-drop buses are used for interconnect, then ease of manufacture is improved, but power consumption increases
Solution Approach 1:
The patent segments the interconnect architecture into dedicated point-to-point links between PHY and MAC layers, replacing traditional multi-drop buses. This segmentation allows for more efficient power management where each link can be independently controlled and powered down when not in use, reducing overall power consumption while maintaining ease of manufacture through modular implementation.
Data Source
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AI summary
The invention is directed to a method and apparatus comprising physical layer (PHY) logic, a register, an interface to couple the physical layer logic to a media access layer (MAC), wherein the interface comprises a transmit pair to send data to the MAC, a receive pair to receive data from the MAC, a message bus interface to receive a write command from the MAC (925a), wherein the write command causes a value to be written to the register, and the value identifies a recalibration request, and recalibration logic to perform a recalibration of a PHY receiver based on the recalibration request.