We flip bits in every memory of the chip.
The configuration memory holds the design. The application memories hold the data while it runs: flip-flops, BRAM and LUTRAM. Many tools only flip bits in the configuration memory. SK-RAFT does both.
Tested on EarthTrusted in Orbit
A new standard for radiation reliability testing.
SK-RAFT injects radiation-induced bit flips into real FPGAs, right from your desk.
LEO → GEOSatellites & space systems
Aviation altitudeAircraft & avionics
On the roadAutomotive
On the groundData centers
Why it matters
One bit flips. Your design changes.
Radiation from space can flip a bit inside a chip: a 0 becomes a 1. Nothing breaks and nothing warns you.
In SRAM-based FPGAs the configuration memory is the circuit itself. One upset can quietly rewire part of your design and stay there until it is detected and repaired.
Radiation beam testing remains essential, but beam time is scarce and very expensive. Find which bits affect your design early and keep it to a minimum.
Inside the FPGACircuit open
Circuit open. The switch opens and the connection is cut. Logic B gets nothing, and the chip gives no warning.
Where bit flips happen
The higher you go, the less Earth protects you.
The atmosphere and Earth's magnetic field hold most particles back, but not all. Bit flips happen on the ground, more often at aviation altitude, and far more often in orbit. That affects data centers, cars, aircraft and satellites alike.
- Deep spacebeyond the magnetic field
No protection from Earth at all.
- GEO · LEO36,000 km · 400 km
Far more bit flips in orbit, for every satellite that has to keep working for years.
- Aviation≈ 11 km
Less atmosphere above the aircraft means more bit flips in its avionics.
- Ground0 km
Neutrons reach the ground too. Bit flips happen in data centers and in cars.
The bars show how much the atmosphere and Earth's magnetic field protect each altitude.
The radiation lab, on your desk.
SK-RAFT is an FPGA-in-the-loop EDA tool. It injects the same bit flips that radiation causes, straight into your design, so you can find the bits that matter, prove your mitigation works, and make your design more reliable.
We aim at the bits that can break your design.
SK-RAFT can flip only the essential bits, or only the bits in one area of the chip (a Pblock) or in one component of your design. That saves a lot of test time.
We talk to your design while we test.
Over the same USB cable (JTAG), SK-RAFT sends inputs to your design and reads its outputs. You see the effect of each bit flip at once.
It fits the test setup you already have.
Control SK-RAFT with Python API scripts. Other languages can be supported through its gRPC interface. No hardware modification and no change to your design.
Supported devices
Runs on AMD-Xilinx FPGAs today.
- 7-SeriesSupported
- Zynq-7000Supported
- UltraScale+Supported
- Zynq UltraScale+Supported
- VersalComing next
Why SK-RAFT
Side by side, the difference is clear.
| Typical tools |  | |
|---|---|---|
| Configuration memorythe circuit itself | Yes | Yes |
| Flip-flops, BRAM, LUTRAMthe data while it runs | Rarely | All of them |
| Only the bits that matteressential bits, one area, one component | Sometimes | All three |
| Talk to your designinputs in, outputs out, during the test | Extra setup | Same USB cable |
| Changes to your designto run a campaign | Often extra IP | None |
| Automationfits your test setup | Tool-specific | Python API · gRPC |
Typical tools: common FPGA fault-injection approaches as publicly documented. Want a comparison with a specific tool? Ask us.
| Beam test only | | |
|---|---|---|
| Where | A facility abroad | Your own desk |
| Start | Weeks or months for a slot | Today |
| Beam-time fees | Very high | None |
| Which bit flips | Random | You choose |
| Same fault again | Not possible | Every time |
| Effect of each flip | Hard to trace | Seen at once, logged |
| Final qualification | Still required | Makes it short and targeted |
Beam testing stays essential for final qualification. SK‑RAFT finds the bits that matter first, so the time you book in the beam is short and targeted.
In our lab
Real boards. Real campaigns.
This is where SK-RAFT is built and used: fault-injection campaigns on AMD-Xilinx development boards, in our lab.
Track record
Proven in the beam, not only in the lab.
May 2025 · United Kingdom
Operated live in a neutron beam.
SK-RAFT ran during a real radiation campaign at ISIS ChipIR, a facility built to test chips with atmospheric-like neutrons.
TRL 8
1 · Idea9 · In service
€300k
From Corallia Ventures, now a shareholder in SOLIDKOSMOS.
ESA EPIC European–Australian Space Startup Competition
ESA BIC Greece alumni
We completed the European Space Agency's business incubation programme in Greece.
First spin-off of the University of Piraeus
Founded out of the Embedded Systems Laboratory (ESLab).
Reliability engineering
We test for bit flips. We also design for them.
Our founders have more than 15 years each in fault-tolerant computing, FPGAs and space systems. Bring us in when you need the expertise as well as the tool.
Fault-injection campaigns
Experiment design and fault-injection campaigns on your design, run by our team with SK-RAFT.
Radiation testing campaigns
End-to-end radiation testing for FPGA applications, from facility access to the final report.
Radiation-report analysis
We analyse beam-test results and estimate the reliability of your design on its target device.
Dependability assessment
System-level reliability analysis, including FTA, FMECA and FDIR strategy design for safety-critical embedded systems.
Designs that tolerate bit flips
Mitigation for COTS SoC FPGAs, drawing on our ESA work on lockstep-based protection against single-event effects.
Embedded software & acceleration
FPGA hardware acceleration and embedded software development for safety-critical systems.
Pilot phase
Try SK-RAFT on your own design.
We are inviting teams who build FPGA-based systems to use SK-RAFT on their real designs.
Pilot Limited places
The full version of SK-RAFT, free for a short time, for teams with a real project. We have a small number of pilot places.
Free trial For everybody
A limited version of SK-RAFT, so you can see how it works. We email you the link.