|
|
|
|
# ULX3S PCB
|
|
|
|
|
|
|
|
|
|
This is work-in-progress place for putting
|
|
|
|
|
some wishes of a small (94x51 mm) FPGA board.
|
|
|
|
|
|
|
|
|
|
Instead of describing in written,
|
|
|
|
|
it is better explained when drawn in kicad:
|
|
|
|
|
|
|
|
|
|
kicad ulx3s.pro
|
|
|
|
|
|
|
|
|
|
[Schematics](/doc/schematics.pdf) is mostly complete.
|
|
|
|
|
PCB routing is not complete (about 50 routes missing).
|
|
|
|
|
|
|
|
|
|
3D preview
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# Features
|
|
|
|
|
|
|
|
|
|
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 stereo jack
|
|
|
|
|
|
|
|
|
|
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)
|
|
|
|
|
|
|
|
|
|
Power: 3 Switching voltage regulators: 1.2V, 2.5V, 3.3V
|
|
|
|
|
|
|
|
|
|
Low power sleep: RTC clock wakeup, quartz and battery
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
GPDI is General Purpose Differential Interface,
|
|
|
|
|
Electrically LVDS, mostly TMDS tolerant
|
|
|
|
|
female receptacle more-or-less compatible
|
|
|
|
|
with digital monitors/TVs
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# Todo
|
|
|
|
|
|
|
|
|
|
Finish routing and especially improve Power
|
|
|
|
|
section (thicker power lines, separately routed feedback)
|
|
|
|
|
|
|
|
|
|
2.54 mm external JTAG header
|
