Sipeed Tang Nano 20K FPGA Development Board - GW2AR-18 LUT4 High-Performance Kit

Specifications

• Core FPGA Chip: GW2AR-18 (GW2AR-LV18QN88C8/I7)
• Logic Density: 20,736 LUTs (Look-Up Tables)
• Flip-Flops: 15,552 FF

      Memory:

• SDRAM: 64M-bit (32-bit width) integrated
• Flash: 64M-bit NOR Flash (for bitstream storage)
• Block SRAM: 828K bits

• Multipliers: 48 DSPs (18 x 18 multipliers) for signal processing
• Onboard Debugger: BL616 (USB-to-JTAG + USB-to-UART) - No external programmer needed!

       Display Interfaces:

• HDMI: Standard HDMI connector (drives up to 1080p, optimized for 720p gaming)
• LCD: 40-pin RGB LCD interface
• Clock Generator: Onboard MS5351 provides customizable clocks alongside the 27MHz crystal.
• Peripherals: 2x User Buttons, 6x LEDs, 1x WS2812 RGB LED, MicroSD Card Slot.
• Package Type: Simple Package (Headers Included but Unsoldered).

Project Evolution
      Where does this fit in your journey?

• Prerequisites (The "Before"): You have likely mastered the Arduino Nano or ESP32. You understand digital logic (AND/OR/NOT gates) but are frustrated by the microsecond delays of software interrupts.
• The Upgrade (This Product): The Tang Nano 20K unlocks True Parallel Processing. Unlike a CPU that does one thing at a time, this FPGA can do 20,000 things simultaneously.

• Unlock: Retro Gaming Emulation. This board is powerful enough to run a cycle-accurate NES (Nintendo) emulator directly on hardware.
• Unlock: Custom RISC-V Cores. Don't just program a processor; build one inside this chip and run Linux on it.

• Effort Level: Advanced. Requires learning Verilog or VHDL.
• Minimum Hardware: You will need a soldering iron to attach the headers and a USB-C cable for programming.

Wiring Guide
Warnings:

• Voltage Logic: The GPIO pins on the Tang Nano 20K operate at 3.3V. Connecting 5V logic (like from an Arduino Uno) directly will destroy the FPGA pins. Always use a Logic Level Converter.
• Soldering Required: This unit comes with pin headers loose in the bag. You must solder them yourself. Ensure you do not bridge the tiny pads on the PCB during soldering.
  
  Pin Mapping (Common Interfaces):
• UART (via BL616): The onboard USB-C port handles UART communication automatically. You do not need to wire external TX/RX pins for basic serial monitoring.
• HDMI: Plug-and-play via the onboard connector. Note that high-resolution video consumes significant LUT resources.
• JTAG: Internal connection via USB-C. No external J-Link or ST-Link required.

Package Includes:

• 1x Sipeed Tang Nano 20K FPGA Development Board
• 2x 20-Pin Headers (Unsoldered/Loose)
• 1x USB-C Data Cable

Applications
Industry & Commercial Use Cases:

• Digital Logic Education: The ideal platform for university labs teaching Verilog/VHDL, allowing students to visualize logic gates and timing diagrams on real hardware rather than just simulation.
• Display Interface Bridging: Used by R&D engineers to prototype custom display drivers, converting SPI/Parallel signals to HDMI or RGB interfaces for industrial HMI panels.
• Soft-Core Processor Research: A low-cost testbed for designing and modifying RISC-V processor cores (like PicoRV32) before migrating to expensive silicon production.
• High-Speed Signal Processing: Capable of parallel data acquisition and signal filtering (DSP) that exceeds the sequential processing limits of standard microcontrollers.

Frequently Asked Questions (Technical FAQ)

• Do I need an external JTAG programmer for the Tang Nano 20K?
  No, the board has an onboard BL616 chip that acts as a USB-to-JTAG bridge, allowing you to flash it directly via the USB-C cable.
• Which software do I use to program this board?
  You need the Gowin EDA (IDE). specifically the "Educational Edition" which supports the GW2AR-18 chip.
• Does this board support Verilog and VHDL?
  Yes, the Gowin IDE supports both Verilog and VHDL hardware description languages.
• Can I run Linux on this FPGA?
  Yes, the GW2AR-18 has enough logic and onboard SDRAM (64Mb) to run a lightweight RISC-V Linux build.
• Are the header pins pre-soldered?
  No, this is the "Simple Package" version. The pins are included in the bag but require user soldering.
• What is the logic voltage of the GPIO pins?
  The I/O banks operate at 3.3V. It is NOT 5V tolerant.
• Can I drive an HDMI monitor directly?
  Yes, the board features a standard HDMI connector and can generate video signals (e.g., 720p or 1080p) directly from your logic design.
• How do I use the onboard screen connector?
  There is a 40-pin connector compatible with specific RGB LCDs (usually 4.3" or 5.0" 480x272 or 800x480 panels).
• What is the purpose of the MS5351 chip?
  It is a programmable clock generator that provides precise additional clock frequencies to the FPGA, useful for video and audio timing.
• How much Block RAM (B-SRAM) is available?
  It has approximately 828K bits of Block SRAM available for your design.
• Is there a community for this board?
  Yes, there is an active community on GitHub (Sipeed) and Reddit (r/GowinFPGA) with many open-source examples.
• Can I use this for retro gaming emulation?
  Absolutely. It is the primary target hardware for the "NESTang" project which emulates the NES console.
• Does it support audio output?
  The board does not have a 3.5mm jack, but it supports digital audio via HDMI or I2S through the GPIO pins.
• What is the maximum clock speed?
  The internal logic speed depends on your design complexity, but the PLLs can generate clocks up to several hundred MHz.
• Does the board overheat?
  For basic logic it runs cool. For heavy video processing (HDMI), the chip can get warm, but a heatsink is usually not strictly required for hobby use.
• How do I power the board?
  Power is supplied via the USB-C port (5V).
• Can I use the microSD card slot for data logging?
  Yes, the microSD pins are connected to the FPGA, allowing you to implement SPI or SDIO controllers to read/write data.
• What is the difference between Nano 9K and Nano 20K?
  The 20K has more than double the logic units (20K vs 9K) and includes internal SDRAM, making it much better for running soft-core CPUs and video.