Riegel Computer

Description

Riegel is an FPGA-based computer designed for timeless applications.

Specifications

• Lattice ICE40HX4K FPGA
  • 7680 LUTs when using open-source tools
  • 2 PLLs
• 64MB OSPI PSRAM
• 512KB Static RAM (10ns)
• 1MB (8Mbit) NOR Flash (via user-replaceable/upgradeable MMOD module)
• 2 Digilent Pmod™ compatible expansion ports
• 1 MMOD socket
• MicroSD card slot
• USB-C for power and configuration
• PS/2 port for keyboard
• VGA port can support at least 640×480 with 8 colors
• 90mm x 40mm board dimensions (V3B)

Optional Accessories

• Riegel Case
• DDMI PMOD

Resources

• Example gateware, schematics, documentation and a 3D-printable case are available on GitHub
• RISC-V SOC “Zucker” designed specifically for Riegel is available on Github
• There is fork of the iceZ0mb1e Z80 SOC with support for Riegel
• Component Datasheets (PDF)
  • ICE40HX
  • PSRAM
  • SRAM