Parallel Memory Interface for Fast FPGA Reconfiguration
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Solution Overview
Problem
Programmable logic devices face challenges in achieving high-speed data transfer and efficient memory access due to limitations in their current interfaces, which hinder their performance in complex computing tasks such as machine learning, video processing, and image recognition.
Innovation Solution
The implementation of a multi-purpose parallel interface and sector-aligned memory with a network-on-chip (NOC) architecture, allowing for concurrent data exchange and reconfiguration of programmable logic device portions, and providing alternate pathways around powered-down sectors to enhance bandwidth and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional memory interfaces are used in programmable logic devices, then device complexity is reduced, but data transfer speed and memory access efficiency deteriorate
Solution Approach 1:
The memory interface is segmented into multiple independent channels, each capable of parallel data transfer. The memory array is divided into multiple banks that can be accessed simultaneously through different channels, thereby increasing overall data transfer speed without requiring a single complex interface.
Solution Approach 2:
The patent transitions from a single-dimensional sequential access interface to a multi-dimensional parallel interface. Multiple data paths are established simultaneously across different memory banks and channels, adding spatial dimensions to data transfer and significantly improving throughput.
2Productivity
If high-speed parallel interfaces are implemented, then data transfer efficiency improves, but device complexity increases
Solution Approach 1:
The parallel interface is designed with universal control logic that can manage multiple memory banks and channels using the same fundamental protocols and control mechanisms. This multi-functional design allows high-speed data transfer across different memory regions without requiring separate complex interfaces for each bank.
Solution Approach 2:
Multiple memory banks and transfer channels are merged under a unified control structure. The interface combines several data paths and control lines into a coordinated system that operates as an integrated high-speed interface, improving efficiency while managing complexity through consolidation.
3Loss of time
If configuration memory is accessed at high speed, then reconfiguration time is reduced, but power consumption increases
Solution Approach 1:
The high-speed memory access is activated periodically only when reconfiguration is required, rather than continuously. During normal operation, the system switches to lower-power memory access modes, thereby reducing overall power consumption while maintaining fast reconfiguration capability when needed.
Solution Approach 2:
The memory interface operates dynamically, switching between high-speed and low-power modes based on operational requirements. The system adapts its data transfer rate and activation of parallel channels according to whether reconfiguration is in progress or normal operation is occurring.
Data Source
AI summary
An integrated circuit device may include a programmable fabric die having programmable logic fabric and configuration memory that may configure the programmable logic fabric. The integrated circuit device may also include a base die that may provide fabric support circuitry, including memory and/or communication interfaces as well as compute elements that may also be application-specific. The memory in the base die may be directly accessed by the programmable fabric die using a low-latency, high capacity, and high bandwidth interface.