SCSI2SD Schematic Notes
From code/src wiki
Details for the circuit design of [SCSI2SD].
Crystal Oscillator
- LCP1751 requires a 25MHz crystal, which results in a 100MHz clock with x4 PLL
- The crystal requires 2 caps for stability. The required value is:
2 * (CL - CS)
Where CL is the crystal's load capacitance, as specified by the crystal manufacturer, and CS is the PCB's stray capacitance (around 5pF for a reasonable PCB).
3.3V Regulator
LM1117-3.3 Notes on cap values Notes on required current Notes on switching frequency
In-circuit programming
UART0 pins, + active low program enable power supply while programming ? Custom header ? Custom bootloader as well ?
Switches
TERMPWR, terminator, parity, SCSI ID