Chiplet I/O Channel Reordering for Reliable Low-Energy Interconnects
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Solution Overview
Problem
Chiplet systems face challenges in aligning input-output (I/O) operations across multiple chiplets, which can lead to inefficiencies in performance and energy consumption due to the need for high-speed signaling and error correction mechanisms like SERDES, particularly in ultra-short reach chiplet-to-chiplet interconnects.
Innovation Solution
The implementation of a Chiplet Protocol Interface (CPI) network with credit-based flow control and parallel interfaces to minimize latency and energy consumption, along with the use of dedicated device interfaces like memory interfaces and serial peripheral interfaces, enables efficient I/O operations across chiplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-speed signaling and error correction mechanisms like SERDES are used for chiplet-to-chiplet interconnects, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent employs multiple inexpensive SERDES channels that can be quickly initialized and discarded or reconfigured, replacing the need for fewer, more complex, and energy-intensive high-speed signaling paths. Each channel is simple and low-cost, but collectively they provide the required reliability through redundancy and parallel operation.
Solution Approach 2:
The interconnect system is divided into multiple independent SERDES channels rather than using a single high-speed path. Each channel operates at lower speed individually but collectively provides high-throughput communication. This segmentation allows each channel to consume less energy while the aggregate system maintains reliability and performance.
2Productivity
If multiple SERDES channels are used for chiplet-to-chiplet communication, then bandwidth is improved, but device complexity increases
Solution Approach 1:
Multiple SERDES channels are designed with identical, standardized interfaces and protocols, allowing them to perform the same function interchangeably. This universality simplifies the overall system architecture by using repeated simple building blocks rather than complex specialized circuits, thereby increasing bandwidth without proportionally increasing complexity.
Solution Approach 2:
Multiple low-complexity SERDES channels are combined to achieve high bandwidth communication. Rather than implementing a single complex high-speed interface, the patent merges several simpler channels working in parallel, where the combined effect provides the required productivity while keeping individual channel complexity low.
3Adaptability or versatility
If channel ordering is not aligned between chiplets, then manufacturing flexibility is improved, but communication reliability deteriorates
Solution Approach 1:
The system dynamically determines and adapts to the actual physical ordering of channels during initialization rather than requiring fixed predetermined ordering. The channel initialization process includes runtime detection and configuration that adjusts to the actual channel arrangement, maintaining reliability while preserving manufacturing flexibility to accommodate different physical layouts.
Solution Approach 2:
The chiplet system performs self-configuration during initialization by automatically detecting the physical channel ordering and adjusting its internal mappings accordingly. This self-service approach eliminates the need for manual configuration or strict manufacturing constraints, allowing the system to adapt to any physical channel arrangement while maintaining communication reliability.
Data Source
AI summary
A method includes setting an order of input-output channels of a column of a first chiplet of multiple chiplets of a chiplet-based system, wherein one or more of the multiple chiplets include field-configurable input-output channels arranged at a periphery of the chiplets; and programming a second chiplet of the multiple chiplets to change an order of input-output channels of a column of the second chiplet to match the order of input-output channels of the column of the first chiplet.