Pipelined FPGA Configuration Memory for Faster Partial Reconfiguration
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Solution Overview
Problem
The performance of partial reconfiguration in programmable devices, such as FPGAs and SoCs, is limited by the distributed memory system, where data lines run across the entire device width, leading to bottlenecks in configuration memory write/read operations.
Innovation Solution
A configuration memory system with a pipelined bi-directional data line structure using source clocking, which includes a configuration memory read/write unit, multiple read/write controllers, and fabric sub-regions with memory cells between buffers and a configuration memory read/write pipeline unit, segmented to improve write/read bandwidth and minimize area and cost.
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 whole device, but the configuration memory write/read performance is limited due to bottlenecks
Solution Approach 1:
The device is divided into multiple fabric sub-regions (FSRs), each with its own dedicated configuration memory port. This segmentation allows parallel configuration operations in different regions, eliminating the bottleneck where a single memory controller had to wait for previous operations to complete. Each FSR can independently perform write/read operations simultaneously.
Solution Approach 2:
The patent introduces a new dimensional approach by organizing configuration memory access in a two-dimensional grid structure with multiple FSRs arranged in rows and columns. This allows configuration data to be distributed across multiple spatial dimensions rather than flowing through a single linear path, enabling parallel access paths and improving overall throughput.
2Productivity
If a memory controller waits for previous write/reads to complete before launching the next operation, then data integrity is maintained, but performance is limited
Solution Approach 1:
Multiple independent memory controllers are created, one for each FSR. Each controller manages its own configuration memory independently, allowing parallel operations without interference. This segmentation maintains data integrity within each region while enabling high-throughput parallel operations across the entire device.
Solution Approach 2:
The pipelined architecture ensures that while one FSR is completing a configuration operation, another FSR can simultaneously initiate a new operation. This continuous pipeline of operations eliminates idle wait times and maintains constant productive action across all memory controllers, improving throughput without compromising reliability.
3Productivity
If the configuration memory system is designed for high performance with multiple controllers and pipelined structures, then write/read bandwidth is improved, but device complexity increases
Solution Approach 1:
The configuration memory system is segmented into multiple FSRs with dedicated controllers, but each controller implements a simplified state machine compared to a single monolithic controller. This segmentation distributes complexity across multiple simpler units rather than concentrating it in one complex controller, making the overall system more manageable and maintainable.
Solution Approach 2:
The patent implements dynamic pipeline staging where data flows through multiple pipeline stages that can be selectively activated. This dynamic approach allows the system to adapt the level of parallelism and complexity based on the specific configuration operation being performed, optimizing performance while managing complexity through conditional activation of pipeline stages.
Data Source
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.