tzechienchu / 07_picorv32

Pico RISCV32 tailored for the DE10-Lite

Pico RISCV32 for the DE10-Lite (MAX10 based)

• CPU @ 64 MHz, according to the summary report it should go up to 105 MHz
• UART: Pin 4 is TX (Output), Pin 6 is RX (Input)
• 2 Resettable Timers
• Minimal GPIO
• 64 k RAM with bootloader (serial loading)
• KEY0 acts as reset button.

SignalTap is active in the project, you may have to disable it, just remove all referencies to it from prv32_top.qsf. Internal RAM reduced to 64 kbytes because SignalTap needs some RAM too. Reconfigure iram.qip to 128 k.

The UART is configured for 1 MBit. Intel Hex downloading seems to work well, I tried with the simple user_app that is in the firmware directory.

ToDo in no particular order:

A next step would be to get that DMA Audio bit working. SDRAM, the board has 64 MBytes of it, I want it working ! VGA Output in text of graphical form. A better bootloader, with write-protection to survive ill-behaving code.