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# ULX3S PCB
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This is work-in-progress place for putting
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some wishes of a small (51x94 mm) FPGA board.
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Instead of describing in written,
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it is better explained when drawn in kicad:
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kicad ulx3s.pro
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[Schematics](/doc/schematics.pdf) is mostly complete.
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PCB routing is not complete (about 50 routes missing).
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3D preview
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# Features
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Power: Switching voltage regulators
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Low power: RTC clock wakeup, quartz and battery
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USB: FTDI FT231XS (1Mbit JTAG and 3Mbit usbserial)
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GPIO: All differential, PMOD-friendly
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RAM: SDRAM
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Flash: SPI flash chip for FPGA config
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Storage: Micro-SD slot
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LEDs: 16 (8 blink-LEDs, 2 USB leds)
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Buttons: 6 (4 direction and 2 fire buttons)
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Audio: 3.5 mm jack footprint
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Video: GPDI connector with 3.3V-5V I2C bidirectional level shifter
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Display: placeholder for 0.96-1.3" SPI OLED COLOR or B/W
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WiFi+bluetooth: placeholder for ESP-32 (JTAG and serial over WiFi possible)
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GPDI is General Purpose Differential Interface,
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Electrically LVDS, mostly TMDS tolerant
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female receptacle more-or-less compatible
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with digital monitors/TVs
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# Todo
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Improve Power supply routing
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2.54 mm external JTAG header
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