Multi-port SERDES Transceiver Ring Bus Architecture
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Solution Overview
Problem
High-speed data links require flexible switching between multiple serial deserializer (SERDES) links in a low power configuration, which existing technologies struggle to achieve efficiently on a single integrated circuit.
Innovation Solution
A multi-port SERDES transceiver chip with multiple parallel and serial ports, a configuration logic circuit, and a packet bit error rate tester (BERT) that allows flexible connection between ports, enabling operation at various data rates and bit error testing, with a substrate layout optimizing port communication through a ring bus structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SERDES links are integrated on a single chip with switching capability, then flexibility and adaptability are improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independent SERDES links (first link, second link, third link, fourth link) each with its own transceiver and logic core. This segmentation allows each link to operate independently while maintaining overall system flexibility, resolving the contradiction by organizing complexity into manageable modular units.
Solution Approach 2:
The switching fabric and logic cores are designed to handle multiple SERDES links through a unified architecture. The switching fabric can route data between any combination of links, and logic cores can process data from multiple sources, providing universal functionality that improves adaptability without proportionally increasing complexity.
2Adaptability or versatility
If switching between multiple SERDES links is implemented, then adaptability is improved, but power consumption increases
Solution Approach 1:
The switching fabric is designed to dynamically activate only the necessary transceivers and logic cores based on current operational requirements. When only one SERDES link is needed, only that link's components remain active, while others are powered down, thus maintaining flexibility while minimizing power consumption.
Solution Approach 2:
The system can discard power to inactive SERDES links and switching resources when they are not currently in use, and recover that power capacity when needed. This allows the system to maintain full adaptability capability while operating at lower power levels during normal single-link operation.
3Productivity
If a ring bus structure is used to connect logic core to multiple data ports, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The ring bus structure uses a closed-loop curved topology instead of straight-line point-to-point connections. This ring topology provides multiple communication paths between logic core and data ports, improving communication efficiency through redundant routing while the regular repeating pattern keeps the design systematic and manageable.
Solution Approach 2:
The ring bus structure is nested within the substrate layout, with data ports positioned on the outer perimeter and the ring bus forming an inner loop around them. This nested arrangement optimizes spatial utilization and reduces the number of intermediate connection elements needed, improving communication efficiency without proportionally increasing complexity.
Data Source
AI summary
A multi-port SERDES transceiver includes multiple parallel ports and serial ports, and includes the flexibility to connect any one of the parallel ports to another parallel port or to a serial port, or both. Furthermore, the multi-port transceiver chip can connect any one of serial ports to another serial port or to one of the parallel ports. The substrate layout of the multi-port SERDES transceiver chip is configured so that the parallel ports and the serial ports are on the outer perimeter of the substrate. A logic core is at the center of the substrate, where the logic core operates the serial and parallel data ports, and the bus that connects the data ports. The bus can be described as a “ring” structure (or donut “structure”) around the logic core, and is configured between the logic core and the data ports.