In fact, the “CPU” in the FPGA is created from a hardware description language,

meaning it can be modified or swapped out. If you wanted, you could create a

brand-new CPU instruction. Do you want to have fast 64-bit multiplies? Or

maybe you want a way to get random numbers easily? With Fomu and its FPGA,

you have the source code to the CPU itself.

Comes with one fully assembled Fomu.

TECHNICAL DETAILS

Features & Specifications



FPGA: Lattice ICE40UP5K (link to datasheet and reference manual

directory)



Speed: 48 MHz external oscillator



RAM: 128 kB RAM for a soft CPU¹



Storage: 1 MB SPI flash²



Connectivity: USB 2.0 FS (12 Mbps)



Buttons: Four³



LEDs: One RGB



GitHub repository



Fomu page

¹: The FPGA has 1024 kilo-bits of memory available. A separate block of

memory is used for things like the processor register file, in addition to

temporary memory for things like USB buffers. The CPU can use 64 or 128

kilobytes of memory, depending on configuration. ²: This is the minimum

configuration amount — more may be available in the final version.

³: Fomu has four copper pads near the edge. Capacitive touch solutions have not

yet been validated.