Negative Power suplies Mounted/Not mounted
FMCs lacking real state to generate negative power supplies could
beneffit from the carrier -5V, -2V and -12V and the possive +5V. Notice
that as they are not compatible with the Vita 57 standard their use is
NOT RECOMMENDED.
Normally they will be mounted if really required.
To unmount negative power supplies:
- All components instantited in the schematic page power_supply_negative should be unmounted.
- R292 and R309 in page power_supply_switching should be changed to 4k2 and 2k4 to reduce the 5V voltage to 3V7. The 5V is used to generate a clean 3V3.
- On page fmc_connector do not mount: C572, R67, R68, R71, R76, C394, R113, R103, C36, R66, R65, R70, R75, R91, R90, C251, R287, R286, C407, R349, R350, R278, R282, R337, R336.