const fpga2 = 1;
const fpga1 = 2;
const scsn_sw = 0x4400;
// scsn ring fpga2+fpga1
write fpga2, scsn_sw, 1;
reset;
write fpga2, scsn_sw, 6;
reset;
write fpga2, scsn_sw, 0;
write fpga2, 0x4020
write fpga2, 0x4030