Partial Bitstream Relocation Across Non-Identical FPGA Regions
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Solution Overview
Problem
Conventional programmable logic devices (PLDs) have limited relocatability of partial configuration bitstreams, restricting the instantiation of modules to areas with identical logic and configuration memory layers, which limits module diversity and increases the commitment of FPGA fabric, often requiring larger and more expensive devices.
Innovation Solution
A method to enhance relocatability by identifying differences in logic resources between areas and setting prohibit constraints, allowing partial bitstreams to be configured for relocation to non-identical logic layers, using modular configuration bitstreams with block bitstreams derived from a reference logic layer and divided configuration data for instantiation and masked-off portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If partial bitstreams are restricted to areas with identical logic and configuration memory layers, then configuration simplicity is maintained, but relocatability and module diversity are limited
Solution Approach 1:
The configuration bitstream is divided into multiple segments, each associated with specific logic resources in different areas of the FPGA. Each segment can be independently configured and relocated to different target areas, allowing partial bitstreams to be moved without requiring identical logic layers across all areas. This segmentation enables flexible relocation while maintaining configuration manageability.
Solution Approach 2:
The configuration mapping mechanism is designed to be universal across different logic resource types and areas. A single configuration data structure can map to multiple different logic resource configurations through parameterized addressing and resource identification, allowing the same configuration bitstream to be relocated to various target areas with different logic layers without requiring area-specific configuration variants.
2Adaptability or versatility
If modules are instantiated only in areas with equivalent logic layers, then configuration consistency is ensured, but the number of instantiable module types is reduced
Solution Approach 1:
The configuration system allows different areas of the FPGA to have locally optimized logic resource configurations tailored to specific module requirements. Each target area can have customized logic layers and resources configured according to the specific needs of the module being instantiated, while the overall configuration maintains consistency through centralized management and validation of the configuration data structure.
Solution Approach 2:
The configuration mapping uses parameterized addressing and resource identification that can adapt to different logic resource types and configurations. By changing parameters such as target area coordinates, logic resource identifiers, and resource type specifications, the same configuration framework can support instantiation of diverse module types across areas with different logic layers while maintaining configuration integrity through parameter validation.
3Adaptability or versatility
If FPGA fabric is committed to accommodate different module types in equivalent areas, then module diversity is supported, but device size and cost increase
Solution Approach 1:
The configuration system adds a new dimension of flexibility by allowing relocation across areas with different logic layers, not just within equivalent areas. This vertical dimension of relocation (across different logic layer heights) complements the traditional horizontal relocation (within same logic layer), enabling modules to be placed in underutilized areas and reducing the need for oversized FPGAs to accommodate module diversity.
Data Source
AI summary
Enhancing relocatability of partial configuration bitstreams from a first area to a second area of programmable logic of an integrated circuit is described. A first set and a second set of logic resources of the programmable logic are identified. The first set and the second set of logic resources are respectively associated with the first area and the second area, the second area being wholly or partially offset from the first area. Differences between the first set of logic resources and the second set of logic resources are identified. The differences are associated with one or more of different types of circuit resources in each of the first area and the second area. Prohibit constraints associated with the differences are set.