Honored Contributor
Honored ContributorHi Lorenzo,
--- Quote Start --- I already supposed I had to do the analysis you talked about, I was just wondering if the information about the total current consumption of the board itself from 3.3 V reference line was already known and available somewhere. --- Quote End --- Even if it was, you're always better off double-checking with your own analysis. --- Quote Start --- Meanwhile, in these days, a few other system considerations persuaded me I have to use some other voltage regulators on my custom pcb, so I'll need an external power supply anyway. --- Quote End --- When designing systems with multiple power rails, its always worth considering the power-on sequence. In the case of your design, since it will be driving FPGA I/Os, and those I/Os are hot-swappable, there is no power-sequencing issue. However, I would recommend using an FPGA GPIO to enable the power to your custom board. That way, even though you have multiple power sources (the DE115 and the external wall-wart), when you turn on the power to the DE115, it will in turn power-up your custom I/O board. --- Quote Start --- Again, I have to thank you for your always useful, clear and precise support. --- Quote End --- You're welcome. Cheers, Dave
