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No open-drain in V5 to drive an external LED?
HI,
on our PCB there is a LED directly connected to a Virtex5 I/O pad. The LED is connected through a series resistor to 3.3 V. As it seems Virtex devices do not support open-drain outputs. If I drive a zero on that output there will be current flowing from the 3.3V through the LED into the FPGA. Does the FPGA tolerate that? Which I/O standard/fashion should I use? regs, Heiner |
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