How much is the maximum current of FPGA

I use 74LVTH16245 and ULN2803 in our former design to decrease power consumption in FPGA.I know it's a better choice.I just want to know whether there is a constraint:confused: .Some MCU's pin can source/sink dozens of mA,but the summation of the current is limited to hundreds of mA,even if it has lots of pins.Did you want to tell me that I can't calculate the total current by adding each current of I/O simply,But to use something like advanced I/O analysis? I know nothing about it.