mirror of https://github.com/YosysHQ/picorv32.git
1.5 KiB
1.5 KiB
PicoRV32 SPI-Flash Demo
This is a simple PicoRV32 example design that can run code directly from an SPI flash chip. This example design uses the Lattice iCE40-HX8K Breakout Board.
The flash is mapped to the memory region starting at 0x80000000. The reset vector is set to 0x80100000, i.e. at the 1MB offset inside the flash memory.
A small scratchpad memory (default 256 words, i.e. 1 kB) is mapped to address 0x00000000. A simple GPIO controller is mapped to address 0xC0000000.
Run make test to run the test bench (and create testbench.vcd).
Run make prog to build the configuration bit-stream and firmware images
and upload them to a connected iCE40-HX8K Breakout Board.
| File | Description |
|---|---|
| top.v | Top-level Verilog module for the design |
| spimemio.v | Memory controller that interfaces to external SPI flash |
| spiflash.v | Simulation model of an SPI flash (used by testbench.v) |
| testbench.v | Simple test bench for the design (requires firmware.hex). |
| firmware.s | Assembler source for firmware.hex/firmware.bin. |
| pinout.pcf | Pin constraints for implementation on iCE40-HX8K Breakout Board |