Fine-Grain FPGA Reconfiguration for Lower Area and Routing Delay
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Solution Overview
Problem
Current field-programmable gate arrays (FPGAs) face challenges in achieving comparable area, power consumption, and performance to application-specific integrated circuits (ASICs) due to overheads from reconfigurability, resulting in higher silicon area, larger delay, and increased dynamic power consumption.
Innovation Solution
The Fine-grain Dynamically Reconfigurable (FDR) architecture, which deviates from traditional island-style designs by using an array of homogeneous reconfigurable logic elements that can be configured as logic or interconnect, combined with temporal logic folding and distributed memory blocks, reduces interconnects and enhances resource allocation flexibility, leveraging low-power SRAM for efficient reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional FPGAs use extensive reconfigurability structures, then design flexibility is improved, but silicon area increases by 21×
Solution Approach 1:
The FPGA architecture is divided into fine-grained logic elements (LEs) that can be independently configured. Each LE contains configurable logic units and interconnect elements that can be individually programmed, allowing only the necessary portions of the device to be activated for a given application, thereby reducing the effective silicon area used while maintaining design flexibility.
Solution Approach 2:
The patent implements dynamic reconfiguration capabilities where the logic elements and interconnect structures can be reprogrammed at runtime. This dynamic nature allows the same physical hardware to adapt to different logical functions without requiring dedicated structures for each possible function, significantly reducing the overall silicon area needed compared to static reconfigurable designs.
2Adaptability or versatility
If FPGAs implement reconfigurable interconnect structures, then routing flexibility is improved, but delay increases by 3×
Solution Approach 1:
The interconnect architecture implements local routing resources within each logic element that provide fast, direct connections for local signals. These local interconnect structures have optimized timing characteristics and can be configured to provide low-delay paths for time-critical signals, while longer-distance routing uses a hierarchical interconnect structure that balances flexibility and speed.
3Adaptability or versatility
If FPGAs use dynamic reconfiguration capabilities, then adaptability is improved, but dynamic power consumption increases by 10×
Solution Approach 1:
The patent implements power management mechanisms that allow unused logic elements and interconnect resources to be powered down or placed in low-power states. When reconfiguration occurs, only the newly activated elements are fully powered, while previously used elements can be transitioned to lower power modes, significantly reducing overall dynamic power consumption compared to keeping all reconfigurable structures continuously active.
4Quantity of substance
If FPGAs use fine-grain reconfigurable logic elements, then logic density is improved, but device complexity increases
Solution Approach 1:
Each logic element is designed as a universal building block that can be configured to perform multiple different logical functions through programmable interconnect and logic units. This multi-functionality allows a single standardized LE design to replace what would otherwise require multiple specialized components, increasing logic density while actually simplifying the overall device architecture through standardization rather than increasing complexity.
Data Source
AI summary
A field programmable gate array (FPGA) and method of reconfiguring a FPGA are disclosed. The FPGA includes a plurality of logic elements interconnected with reconfigurable switches and at least horizontal and vertical direct links A memory is coupled to the reconfigurable switches, the memory being configured to store at least two run time configurations. The reconfigurable switches are reconfigurable based on a selected run time configuration stored in the memory. The memory may be a nanoelectronic random access memory (RAM). The memory may be configured to store the at least two run time configurations for at least four logic elements. Each logic element may include a look-up-table (LUT), a flip-flop, inputs and outputs. Each logic element may include dedicated carry logic. At least four logic elements may be interconnected with diagonal direct links.