609 Super-Simple-SPI-CPU
609 : Super-Simple-SPI-CPU
- Author: James Ashie Kotey
- Description: A 4-bit CPU using the SPI Flash RAM from the QSPI PMOD to load programs.
- GitHub repository
- Open in 3D viewer
- Clock: 30000000 Hz
How it works
The Super-Simple-SPI-CPU has uses the emulated RP40-RAM to make load and run programs.
How to test
Use the ram flasher app to load a program into the ram and then reset the CPU.
External hardware
Ram Flasher.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | DATA_A[0] | OUT_REG[0] | SPI_CS_N |
| 1 | DATA_A[1] | OUT_REG[1] | SPI_MOSI |
| 2 | DATA_A[2] | OUT_REG[2] | SPI_MISO |
| 3 | DATA_A[3] | OUT_REG[3] | SPI_SCK |
| 4 | DATA_B[0] | OUT_REG[4] | |
| 5 | DATA_B[1] | OUT_REG[5] | |
| 6 | DATA_B[2] | OUT_REG[6] | |
| 7 | DATA_B[3] | OUT_REG[7] | CPU_VALID |