DE1 SPI Tube Connections - hoglet67/BeebFpga GitHub Wiki
| Pi Name | Pin | Direction | Pin | DE1 Name | HDL Name | Colour |
| Ground | 25 | Ground | 12 | GND | Non | Black |
| CE0 | 24 | Pi to Tube | 01 | GPIO_1(0) | p_spi_ssel | Brown |
| CLK | 23 | Pi to Tube | 02 | GPIO_1(1) | p_spi_sck | Red |
| MOSI | 19 | Pi to Tube | 03 | GPIO_1(2) | p_spi_mosi | Orange |
| MISO | 21 | Tube to Pi | 04 | GPIO_1(3) | p_spi_miso | Yellow |
| GPIO17 | 11 | Tube to Pi | 05 | GPIO_1(4) | p_irq_b | Green |
| GPIO12 | 12 | Tube to Pi | 06 | GPIO_1(5) | p_nmi_b | Blue |
| GPIO07 | 26 | Tube to Pi | 07 | GPIO_1(6) | p_rst_b | Purple |
The layout is designed to work on any Raspberry Pi and still leave both the UART and the JTAG connections free!
Cable Used: http://r.ebay.com/iSr9Ga
Tube switch is the 4th from the right