hot socketing question

You apparently didn't find the chapter 11 hot socketing and power-on reset in cyclone iii devices.

It states:

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The device can be driven before power-up without any damage to the device itself.

I/O pins remain tri-stated during power-up. The device does not drive out before or during power-up, thereby affecting other buses in operation.

...

The hot-socketing DC specification is | IIOPIN | < 300 uA.

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This is a common feature of all Altera FPGA.