Segmented Configuration Memory Pipelines for FPGA Reconfiguration Bottlenecks
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Solution Overview
Problem
The performance of partial reconfiguration in programmable devices is limited by the distributed memory system, where data lines run across the entire device width, leading to bottlenecks in configuration memory operations.
Innovation Solution
A configuration memory system with a unique pipeline structure that segments bi-directional data lines using source clocking, minimizing area and cost, and includes flip-flops and multiplexers to improve write/read bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data lines run across the entire device width in a distributed memory system, then configuration data can be accessed across the device, but performance is limited due to bottlenecks in configuration memory operations
Solution Approach 1:
The device is divided into multiple fabric sub-regions (FSRs), each with its own configuration memory read/write controller. This segmentation allows parallel configuration operations in different regions, eliminating the bottleneck of a single centralized controller and improving overall configuration memory operation performance.
Solution Approach 2:
The patent introduces a new dimensional approach by organizing configuration memory access through multiple parallel pipelines distributed across different FSRs rather than a single sequential path. This multi-dimensional parallel architecture enables simultaneous configuration operations across multiple regions, significantly reducing access time and improving productivity.
2Productivity
If a memory controller waits for previous write/reads to complete before launching the next write/read, then data integrity is maintained, but configuration performance is limited
Solution Approach 1:
The patent implements continuous configuration operations by allowing multiple write/read commands to be pipelined through different FSRs simultaneously. Each FSR controller can accept new commands while previous operations are being executed in other regions, eliminating idle waiting time and maintaining continuous useful action across the entire device.
Solution Approach 2:
The configuration data is pre-organized into frame-based structures that can be independently processed by different FSR controllers. This preliminary organization allows controllers to immediately begin processing available data frames without waiting for previous operations to complete, as long as the data is properly segmented and addressed.
3Productivity
If distributed memory system is used with data lines running across entire device width, then configuration data can be stored and accessed, but area and cost increase
Solution Approach 1:
Configuration memory is segmented into distributed storage units located within each FSR rather than requiring a single large centralized memory structure. This segmentation reduces the total area required by eliminating redundant data paths and allowing each region to store only its specific configuration data, improving area efficiency while maintaining full configuration access capability.
Data Source
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AI summary
An example configuration system for a programmable device includes: a configuration memory read/write unit configured to receive configuration data for storage in a configuration memory of the programmable device, the configuration memory comprising a plurality of frames; a plurality of configuration memory read/write controllers coupled to the configuration memory read/write unit; a plurality of fabric sub-regions (FSRs) respectively coupled to the plurality of configuration memory read/write controllers, each FSR including a pipeline of memory cells of the configuration memory disposed between buffers and a configuration memory read/write pipeline unit coupled between the pipeline and a next one of the plurality of FSRs.