We have designed several versions of Morphle Logic asynchronous runtime reconfigurable arrays. They can do the same as FPGA's but are not exactly the same gate arrays, as explaind in this readme:

https://github.com/fiberhood/MorphleLogic/blob/main/README_M...

You can add Morphle Logic to any processor including RISC-V and program/reconfigure the gate array by just writing SRAM. So you can reprogram small parts in nanoseconds if you want, even while the circuit is running! We've added a small RISC-V processor to make it easy to reprogram the Morphle Logic.

There is a small caveat: you can not buy our chips yet... I need $100K and 3 months to tape out new chips first.

An equivalent Morphle Logic of a small FPGA like the ICE40 would cost half a dollar, the equivalent of an Virtex Ultrascale would cost around $600. Some parts of these reconfigurable arrays could run at 12 Ghz.

Email us at morphle [at] ziggo { dot} nl