Sipeed Tang Primer 20K Development Board

Sipeed Tang Primer 20K GOWIN GW2A FPGA Development Board   1. Introduction Tang Primer 20K is a core board with DDR3 sodimm shape based on GW2A-LV18PG256C8/I7 as the main chip, with 2 ext-boards are prepared, the Dock and the Lite. 2. Comparison between ext-board 2.1. Dock ext-board appearance The corresponding pins numbering of LED2 and LED3 is N16 and N14. See the mark on left of the right picture. 2.2. Lite ext-board appearance The corresponding pin numbering between R8 and P9 is P8. See the mark on the top left of the right picture. 3. Additional message Sipeed Tang Primer 20K GOWIN GW2A FPGA Development Board's default bank voltage of bank 0、bank 1、bank 7 on the core board is 3.3V, so their bank IO voltage is 3.3V output. If you want to custom the input IO bank voltage, please remove R5 and R9, see Assembly Click me to see where is R5 and R9. And the corresponding golden finger on core board are as following:  4. Questions 4.1. Dock ext-board not work For Sipeed Tang Primer 20