Open Source FPGA Synthesis with the icoBoard

• Website
  • Schematic
• Purchase at Trenz Electronic
  • icoBoard v1.1 with 1 MBit SRAM @ €49.00
  • icoBoard v1.1 with 8 MBit SRAM @ €89.00
  • icoUSBaseboard (FTDI interface board for icoBoard) @ €39.00

• IceStorm tool-chain - needed for synthesis.
  • Yosys
  • IceStorm
  • arachne-pnr
• icoprog from within the icotools repository - needed to load the bitstream into the IcoBoard.
• Icarus Verilog - needed for simulation.
• Verilator - another verilog simulator.
• GTKWave - needed for visualization of simulation results.'
• iCE40 Layout Viewer

module top(input clk_100mhz, output [3:1] led);

reg [25:0] counter = 0;
assign led = counter[25:23];
always @(posedge clk_100mhz) counter <= counter + 1;

endmodule     

set_io clk_100mhz R9
set_io led[1] C8
set_io led[2] F7
set_io led[3] K9

synthesize: demo.bin

demo.blif: top.v
	yosys -q -p "synth_ice40 -blif demo.blif" top.v

demo.asc: demo.blif demo.pcf
	arachne-pnr -d 8k -p demo.pcf $< -o $@

demo.bin: demo.asc
	icepack $< $@

.PHONY: synthesize

• GitHub Repository
• Pmods
  • Pmod BTN @ $7.99
    • Technical Reference
  • Pmod OLEDrgb @ $19.99
    • Technical Reference

• GitHub Repository (fork of cliffordwolf/icotools)
• Pmods
  • Pmod SSD (7-segment Display) @ $6.99
    • Technical Reference
• PicoRV32 Source

1. Install the IceStorm tool-chain (Yosys, arachne-pnr, icestorm)
2. Download/clone a copy of the my fork of the icotools repository
3. Build the RISC-V version of gcc (and friends), as described by the instructions in the Installing the RISC-V Toolchain section of the README file.
4. Enter the icotools/icosoc/examples/otl-demo directory, and run this command with the appropriate IP address for the RaspberryPi.

      $ SSH_RASPI='ssh pi@<rpi-ip-address>' make run 

• TOFE - Tim’s Open FPGA Expansion. Uses PCIe connectors.
• syzygy - Uses Samtec connectors.

• Currently Supported techlibs in Yosys
• VTR (Verilog-to-Routing) VPR (Versatile Place and Route) routing tool
• Project X-ray
  • SymbiFlow
  • XC7A50 Tile Viewer (requires Google Chrome)

• EEVblog Guest Video
  • Forum