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Minimal required parts

When manually assembling boards, it is good to know the minimal parts list that has to be assembled for the board to respond and be programmed.

FPGA

U1

Switching power supplies:

C1,U3,L1,C2,RA1,RB1,C3,C4,C22,C17
C9,U4,L2,C10,RA2,RB2,C11,C12,C23,C19
C5,U5,L3,C6,RA3,RB3,C7,C8,C24,C20

Power-up and hold circuit:

US1               - USB connector
D8                - US1 power routing diode
R10,D12           - USB power up
D16,R3,B0         - BTN0 power up
R6,Q1,D13,D10,R1  - power up transistor
D11,R4,R2         - power hold

FPGA decoupling capacitors, board could probably work without them:

C17,C19,C20,C25,C26,C31,C32,C27,C28,C29,C30

USB-serial to program FPGA over USB. FPGA can also be programmed without USB-serial chip using J4 JTAG header and external JTAG programmer:

R49,R50,R9,U6

Clock 25MHz to properly clock examples. FPGA will respond with JTAG ID and can be programmed even work for combinatorial-only examples (no registers) without this clock.

Y1
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