Parallel Die Interface for Faster FPGA Configuration
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Solution Overview
Problem
As programmable logic devices become increasingly complex, the speed of configuration and reprogramming becomes a substantial challenge due to the limitations in data transfer interfaces, particularly in multi-dimensional die structures, which hinder their performance in tasks like machine learning, video processing, and image recognition.
Innovation Solution
A high-speed parallel interface is introduced between two separate die in programmable logic devices, enabling parallel data exchange and incorporating a network-on-chip (NOC) system in the base die to enhance bandwidth, facilitate sector-aligned memory operations, and provide alternate communication pathways, thus accelerating configuration and reprogramming processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional sequential interface is used for data transfer in multi-dimensional die programmable logic devices, then device complexity is reduced and ease of manufacture is improved, but configuration speed and reprogramming speed deteriorate significantly
Solution Approach 1:
The interface is segmented into multiple parallel data transfer channels (e.g., multiple TMIO interfaces) that operate simultaneously. Each channel handles a portion of the configuration data, enabling parallel transfer across the die interface. This segmentation directly increases configuration speed while distributing the interface complexity across multiple manageable channels rather than requiring a single complex high-speed interface.
Solution Approach 2:
The patent transitions from a traditional single-die architecture to a multi-dimensional stacked die architecture with vertical interconnects. This adds a vertical dimension to data transfer, allowing configuration data to flow through multiple layers simultaneously via through-silicon vias (TSVs) or micro-bumps. The dimensional change enables parallel data paths that dramatically increase configuration speed without proportionally increasing interface complexity.
2Productivity
If a high-speed parallel interface with network-on-chip is implemented, then configuration speed and reprogramming speed are dramatically improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The network-on-chip (NoC) infrastructure is designed to serve multiple functions beyond just configuration data transfer. The same parallel interface and NoC routing structures are used for configuration programming, operational data transfer, and inter-die communication. This multi-functionality justifies the increased manufacturing complexity by providing high-speed capabilities across multiple operational modes rather than requiring separate dedicated structures for each function.
Solution Approach 2:
The patent introduces intermediate buffer memory structures and controller logic that mediate between the high-speed parallel interface and the programmable logic fabric. These intermediaries absorb timing variations and simplify the interface requirements for the programmable logic elements, making the high-speed interface more manufacturable by decoupling the complex parallel transfer requirements from the logic programming process.
3Quantity of substance
If data transfer is performed sequentially through a single interface channel, then interface design is simpler and manufacturing is easier, but bandwidth and configuration time are insufficient for complex computing tasks
Solution Approach 1:
The patent merges multiple data transfer functions into a unified parallel interface structure. Configuration data, operational data, and control signals are combined into a single high-bandwidth parallel bus system that leverages the multi-dimensional die stacking. This consolidation increases effective bandwidth by utilizing all available vertical interconnect resources simultaneously, rather than requiring separate dedicated interfaces for each data type, thus increasing bandwidth without proportionally increasing overall interface structure complexity.
Data Source
AI summary
An integrated circuit device may include programmable logic fabric disposed on a first integrated circuit die and having configuration memory. The integrated circuit device may also include a base die that may provide memory and/or operating supporting circuitry. The first die and the second die may be coupled using a high-speed parallel interface. The interface may employ microbumps. The first die and the second die may also include controllers for the interface.