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Чтением Datasheets, личным (и не только) опытом.
Если вы располагаете другими сведениями, будет весьма любопытно вас выслушать.
P.S. Altera ACEX 1K Data Sheet. Power sequencing & Hot Socketing. p.41
Because ACEX 1K devices can be used in a mixed-voltage environment,
they have been designed specifically to tolerate any possible power-up
sequence. The VCCIO and VCCINT power planes can be powered in any
order. Signals can be driven into ACEX 1K devices before and during power up without damaging the device. Additionally, ACEX 1K devices do not drive out during power up. Once operating conditions are reached, ACEX 1K devices operate as specified by the user.
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