1.2 KiB
ULX3S PCB
This is work-in-progress place for putting some wishes of a small FPGA board.
Instead of describing in written, it is better explained when drawn in kicad:
kicad ulx3s.pro
Schematics is mostly complete. PCB routing is not complete (about 50 routes missing).
3D preview
Features
Power: Switching voltage regulators
Low power: RTC clock wakeup, quartz and battery
USB: FTDI FT231XS (1Mbit JTAG and 3Mbit usbserial)
GPIO: All differential, PMOD-friendly
RAM: SDRAM
Flash: SPI flash chip for FPGA config
Storage: Micro-SD slot
LEDs: 16 (8 blink-LEDs, 2 USB leds)
Buttons: 6 (4 direction and 2 fire buttons)
Audio: 3.5 mm jack footprint
Video: GPDI connector with 3.3V-5V I2C bidirectional level shifter
Display: placeholder for 0.96-1.3" SPI OLED COLOR or B/W
WiFi+bluetooth: placeholder for ESP-32 (JTAG and serial over WiFi possible)
GPDI is General Purpose Differential Interface, Electrically LVDS, mostly TMDS tolerant female receptacle more-or-less compatible with digital monitors/TVs
Board
Todo
Improve Power supply routing
2.54 mm external JTAG header