Late Binding Control Status Registers Design Compilation
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Solution Overview
Problem
Current electronic design automation (EDA) tools face challenges in designing systems for target devices like FPGAs and ASICs due to inaccurate assumptions about access patterns in pre-designed logic (IP cores), leading to over- or under-design, increased area cost, and timing closure issues, especially when dealing with thousands of control status registers (CSRs).
Innovation Solution
The method involves delivering control status registers in an abstract format rather than pre-defined RTL, allowing system designers to generate RTL descriptions for CSRs later in the design flow, incorporating system requirements directly from users, simulations, or system constraint files, thereby reducing assumptions about access patterns and optimizing the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pre-designed logic (IP cores) with control status registers are delivered in RTL description format, then design generation is faster, but the design cannot be customized to specific system requirements leading to over- or under-design
Solution Approach 1:
The patent segments the CSR definition into two independent parts: (1) a reusable abstract CSR description delivered with IP cores, and (2) system-specific CSR configuration parameters. This allows the RTL generation to be separated from the specific system requirements, enabling both fast generation and customization.
Solution Approach 2:
The patent performs preliminary action by delivering CSR descriptions in abstract format beforehand, before system requirements are finalized. This allows the IP core to be prepared in advance while leaving room for later customization based on actual system needs.
2Device complexity
If pre-designed logic assumes standard access patterns for CSRs, then design complexity is reduced, but area cost increases due to over-design
Solution Approach 1:
The patent enables parameter changes by allowing system-specific CSR parameters (access patterns, bandwidth, latency, register widths) to be specified late in the design flow. This allows the CSR implementation to be optimized for actual system requirements rather than assuming conservative standard patterns, reducing area cost while maintaining manageable design complexity.
3Ease of manufacture
If pre-designed logic with CSRs is delivered in RTL format, then integration is easier, but timing closure becomes difficult due to inaccurate access pattern assumptions
Solution Approach 1:
The patent introduces dynamics by making the CSR description adaptable and configurable rather than static. The abstract CSR description can be dynamically instantiated with system-specific parameters late in the design flow, allowing timing optimization based on actual access patterns while maintaining ease of integration through the standardized abstract interface.
4Area of stationary object
If CSRs are customized to specific system requirements, then area cost is reduced, but design flow complexity increases
Solution Approach 1:
The patent introduces an intermediary - the abstract CSR description format - that mediates between the IP core and system-specific requirements. This intermediary maintains a standardized interface for ease of integration while allowing system-specific parameters to be configured, thus reducing area cost without significantly increasing design flow complexity.
Data Source
AI summary
A method for designing a system on a target device includes identifying requirements for a control status register (CSR) to be implemented on the system. Register transfer level description for the CSR is generated in response to the requirements identified.