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The figures on page 19 specify either TTL or LVCMOS/LVTTL, assuming that VCCIO is 3.0 volts or thereabouts.
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You must have your reference page number incorrect. Page 19 has FLEX10K LE operating modes.
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For an all 5-volt system interfacing to CMOS, which one should I select under the device settings? TTL or LVCMOS/LVTTL? Both seem to work fine but neither seems to be right :-)
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The tables on p47 might have what you want. Note how they indicate that VCCIO = 3.3V and that VIH(max) = 5.75V. This indicates that the inputs are 5V tolerant, and note 5 tells you that you can drive external signals onto these I/Os before the power is on.
Cheers,
Dave
Honored Contributor
