Verification of FPGA implementations for functional confidence with schedule and QoR improvements
FPGAs make use of a static hardware matrix, where the ratio of registers to inter-register logic is somewhat fixed. To drive the highest quality designs, state-of-the-art automated design flows, leveraging aggressive optimizations are employed. The combination of these optimizations on a varied range of Register Transfer Level (RTL) code styles can lead to the introduction of “systematic” errors. These errors can occur in unexpected ways, are often time consuming to detect, and potentially destructive.
OneSpin’s FPGA Implementation Verification Solution prevents these problems by applying formal verification to FPGA synthesis. This allows for the highest confidence in design operation, while also improving the development schedule and QoR.
FPGA Implementation Verification
To date, the standard way to find FPGA implementation errors is heavy regression testing on the FPGA itself, with thorough testing that examines every possible operational scenario. This requires many days of stimulus creation and execution, with no guarantee of RTL to gate equivalence.
In addition, if an issue is identified, it is hard to pinpoint the root cause of the problem, due to limited debug visibility in the FPGA device. Finally, after eliminating the problem, the process has to start again, involving time-consuming re-synthesis, and the same heavy regression testing. Specifically, for large FPGA devices, or when safety critical applications are targeted, this can lead to an unbearable burden on the design schedule.
Formal Verification for FPGA Synthesis
Equivalence Checking is commonly used for ASIC design, but to date this has not been possible in FPGAs due to the nature of the sequential optimizations employed. The OneSpin 360 Equivalence Checker, EC-FPGA is ideally suited for FPGA design. Its unique ability to handle retimed FPGA designs makes it an effective tool to track down systematic errors in the synthesis and P&R design flow. This solution is being used by the larger FPGA vendors to test their own synthesis tools, and supports major FPGA synthesis flows.
Applying OneSpin’s FPGA Implementation Verification solution provides the following benefits:
- Confidence that all systematic issues have been eliminated, accelerating the test and debug process
- Elimination of complex test creation or the need to predict systematic error fault conditions.
- Confidence that no systematic-based corner case bugs exist in the final design, increasing reliability
- Leveraging the most aggressive optimizations available, leading to power, speed and utilization improvements.
- 360 EC-FPGA Product Page
- Driving Reliable Base Station FPGA Components
- This case study demonstrates the value of EC in a real design scenario, by discussing the use of the technology by a design team to save time and reduce risk in a complex communications design.
- The Case For Equivalence Checking On Large FPGAs
- This paper examines the reasons why the prevention of systematic errors become a major concern in this emerging application, and the new breed of EC technology required to fulfill this need.
- Microsemi and OneSpin Solutions Target High-reliability Design Verification with Formal-based FPGA Equivalence Checking Solution
- “The MicroSemi ProASIC3 FPGA is a core component of the Advanced Logic System (ALS), and use of the OneSpin 360 Equivalence Checker is an integral part of our FPGA development process for nuclear safety systems.” says Erik Matusek, Safety System Platform Manager at Westinghouse Electric Company, LLC