A fairly low-cost 4-layer AMD/Xilinx Artix-7 FPGA development board with bidirectional and unidirectional high-speed signals, SRAM, DAC and USB-C connection with built-in JTAG programmer. Designed for JLC04161H-7628 layer stackup in KiCad. All available components include JLCPCB parts numbers for assembly. The project includes KiBot configuration for documentation and production files generation automation.
The development board includes:
- Artix-7 FPGA
- USB-C connection to the FPGA via FTDI USB to JTAG (no need for additional external programmer) + optional JTAG for a programmer (in case of USB connection failure)
- 2 unidirectional input and 3 unidirectional output SMA connections to FPGA
- 1 direct bidirectional SMA connections to FPGA
- 2 switched bidirectional SMA connections to a single FPGA pin (controlled from FPGA)
- additional SRAM (4Mb)
- high-speed DAC and op-amp for waveform generation implementation
- separate programmable delay line (delay value selected via DIP switches)
- 24 MHz FPGA clock
- 8-digit 7-segment (+ decimal point) displays with MAX7219 display driver
- 14 programmable LEDs
- 8 programmable push buttons (deglitched)
- 8 programmable slide switched
- powered via USB-C or separate 5.5mm DC barrel jack connector
The built-in FTDI FT232H chip can be used instead of AMD/Xilinx programmer in Vivado Hardware Manager. The FTDI device needs to be configured using Vivado's program_ftdi utility. Refer to the Programming FTDI Devices for Vivado Hardware Manager Support for details.
The KiBot config to automatically generate production files:
- Gerber files
- drill files
- BOM (Bill of Materials)
- CPL (Component Placement List)
Usage:
kibot --schematic "CPArti FPGA dev board.kicad_sch" -c JLCPCB.kibot.yaml JLCPCB
The KiBot config to automatically verify the design and generate documentation files.
- schematic
- PCB top side
- PCB bottom side
- PCB 3D view
The ERC (Electrical Rules Check) and DRC (Design Rules Check) are performed before each file generation.
Usage:
# schematic
kibot --schematic "CPArti FPGA dev board.kicad_sch" -c config.kibot.yaml print_sch
# PCB top & bottom side
kibot --schematic "CPArti FPGA dev board.kicad_sch" -c config.kibot.yaml print_PCB_top print_PCB_bottom
# PCB 3D view
kibot --schematic "CPArti FPGA dev board.kicad_sch" -c config.kibot.yaml 3D_top_view
XC7A50T-FTG256 Datasheets: Artix 7 FPGAs Data Sheet: DC and AC Switching Characteristics (DS181) 7 Series FPGAs PCB Design Guide (UG483) 7 Series FPGAs Clocking Resources User Guide (UG472) 7 Series FPGAs Configuration User Guide (UG470) xc7a35tcsg324 device pinout
Designed for clock signal phase alignment system Reference: https://www.mdpi.com/2079-9292/13/16/3295
Terminations are implemented as suggested in 7 Series FPGAs PCB Design Guide (UG483). PCB cost (and therefore size) optimization is a more important objective than power efficiency. For this reason a Thevenin parallel termination is implemented, since generating a separate VTT=3.3V/2=1.65V would require more space and increase power places complexity.
FTDI FT232H Datasheet: https://ftdichip.com/wp-content/uploads/2020/07/DS_FT232H.pdf
IS61WV25616EDBLL 256k x 16 high speed asynchronous SRAM Datasheet: https://www.issi.com/WW/pdf/61-64WV25616EDBLL.pdf
DS1023 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/DS1023.pdf
DAC: AD9744 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD9744.pdf
op-amp: OPA356 Datasheet: https://www.ti.com/lit/ds/symlink/opa356.pdf
MAX7219 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX7219-MAX7221.pdf
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5.0V DC-DC Converters: Texas Instruments TPS54561 Datasheet: https://www.ti.com/lit/ds/symlink/tps54561.pdf
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3.3V, 1.8V and 1.0V DC-DC Converters: Texas Instruments TPS62823 Datasheet: https://www.ti.com/lit/ds/symlink/tps62823.pdf
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Power Sequencer: Texas Instruments LM3881 Datasheet: https://www.ti.com/lit/ds/symlink/lm3881.pdf
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2x auctioneering Schottky diode for dual supply (USB and barrel jack)
- CPA - Clock signal Phase Alignment, from which the initial idea for the PCB emerged
- Arti - Artix-7 FPGA, the main part of the PCB
- PArt - each part of the dev board PCB is clearly marked