Tang Primer 20K

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.

Buy it: Aliexpress

Parameters

Comparison between ext-board

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.

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.

Comparison between peripherals of ext-board

Hardware information

• Datasheet

• Schematic

• Bit map

• Net Length

• Dimension

• Core board package (KICAD)

• Chip manual

• 3D model

User guide

Install IDE -> Learn coding programmer -> Read Tutorial -> Program by yourself -> Read more official documents

1. Install IDE: Click me.

2. Visit Start to use to avoid some problems, and we can start coding for FPGA there.

3. After coding for FPGA, if you think it difficult, here we collect some useful learning resource.

   • Online FPGA tutorial: Verilog
   • Online Verilog exercise：HDLBits

   If you have trouble using IDE, we have packed all documents about IDE, visit Download station and download what you need.

Reference examples summary

Examples

github ：https://github.com/sipeed/TangPrimer-20K-example

Tutorial

• Lite ext-board blink ：Click me

• Dock ext-board blink : Click me

Communication

• Reddit : reddit.com/r/GowinFPGA/
• Telegram : t.me/sipeed
• Leave message in the end of this page
• Business email : support@sipeed.com

Additional message

The 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:

Questions

Dock ext-board not work

For 20K Dock kits, it's necessary to enable the core board before using debugger debug the chip, just put the 1 switch on the dip switch down, otherwise LED0 and LED1 are on and core board dose not work.

Enable Core Board	Disable state	Additional comments
		When disabled, the LDE0 and LED1 is on, and core board doesn't work.

How to burn into flash

Do following configurations:

No reaction after burning or phenomenon is wrong

Make sure you hace selected right device, and all parameters are the same as following.

Then make sure your code logic is right and your

Successfully burned once, but can't burn after that

Note that the description is there was a successful Flash burnt one time.

In this case, the default reason is that the wrong Dual-Purpose pin is enabled and the debugger can no longer scan the FPGA's JTAG. You can short pin 1 and pin 4 of Flash, by which the chip cannot read FLASH normally when it is powered on.

Besides, if you have dock ext-board, this can be solved by the enable pin of dip switch. Here art the steps

Firstlt, enable the core board, put the 1 switch on the dip switch down, then do something (like burnning fpga or erasing FPGA) in Programmer application, when the progress bar shows, switch the 1 switch on the dip switch up and down, after which you will find the progress bar works and finish your operations on fpga.

	Enable the core board first
	Do operation on board, when progress bar shows, switch the 1 switch on the dip switch up and down
	put the 1 switch on the dip switch up and down
	Progress bar works and finish your operations on fpga

Visit Questions for more