Minimig Board v1.0 schematic
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Board schematic for Minimig board v1.0
Voltage level: (3.3V/(560ohm + 560ohm + 32ohm))*32 ohm*1000 = 91,7mV
Back EMF issues?
Head phones
Notice the resistor of 560 ohm. May cause inlinear output.
PATCH needed to get rev 1 board working:
- Disconnect net SPI_DOUT from pin 81 of FPGA.
- Connect net SPI_DOUT to pin 19 of FPGA (net USER3).
- REASON:
- Pin 81 is an output during FPGA config that blocks SPI to MMC during startup.