Signal Processing Accelerator Routing for Lower FPGA Area
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Solution Overview
Problem
The integration of specialized blocks in FPGAs often results in wasted resources and increased costs due to variability in user needs, as not all blocks are utilized, and it is challenging to determine the required blocks until late in the design process, leading to inefficiencies in FPGA development.
Innovation Solution
A hybrid architecture that includes a network of signal processing accelerators (SPAs) separate from the FPGA, configured with a programmable interconnect network, allowing for flexible routing and operation in various modes, such as symmetric scalar multiplication and complex multiplication, to perform diverse signal processing functions efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If specialized blocks are added to FPGA to improve performance, then speed-critical block performance is improved, but device area and cost increase
Solution Approach 1:
The patent implements a dynamically reconfigurable specialized block where the functionality can be changed at runtime through a configuration interface. The block can switch between different operations (e.g., MAC, adder, serializer) based on control signals, allowing the same physical hardware to adapt to different performance requirements without being permanently dedicated to a single function.
Solution Approach 2:
The specialized block is designed to perform multiple functions including MAC operations, addition, serialization, and other signal processing tasks. By integrating multiple functional capabilities into a single reconfigurable block, the design reduces the need for multiple dedicated blocks, thereby saving device area while maintaining the ability to achieve high performance when needed.
2Device complexity
If specialized blocks are added to FPGA to improve performance, then timing closure effort is reduced, but device cost increases
Solution Approach 1:
The reconfigurable specialized block allows the FPGA design to optimize timing characteristics dynamically. By configuring the block's functionality to match the actual signal processing requirements, the design achieves better timing closure without adding excessive dedicated hardware. The configuration can be adjusted to minimize critical path delays for specific operations.
3Adaptability or versatility
If specialized blocks are added to FPGA family, then functionality is improved, but number of FPGA family members increases
Solution Approach 1:
The patent introduces a universal reconfigurable specialized block that can be configured to perform various signal processing functions. This single versatile block type can replace multiple specialized blocks that would otherwise require different FPGA family members. The block's configuration memory and control logic enable it to adapt to different functional requirements, reducing the need for a large FPGA family.
4Productivity
If specialized blocks are added to FPGA, then performance is improved, but resource waste occurs when blocks are not used
Solution Approach 1:
The reconfigurable specialized block can be dynamically enabled or disabled based on whether its functionality is currently needed. The configuration interface allows the block to be programmed for specific operations only when those operations are required, and it can be reconfigured or deactivated for other tasks. This dynamic adaptation prevents resource waste by ensuring that specialized functionality is only active when providing value.
Data Source
AI summary
Systems and methods for configuring a SPA are disclosed. The SPA comprises a plurality of input ports, a plurality of data memory units, signal processing circuitry, and an enable block including at least two counters. Each counter determines an amount of unprocessed data that is stored in a respective one of the plurality of data memory units, and the enable block is configured to disable the signal processing circuitry until a predetermined amount of data is received over the input ports.