How many states can FPGA's pins export?

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Nope, not in any FPGA I know of at least. Of course they have different IO standards (different voltages, slew rates, drive strength...) and some have configurable weak pullups or bus-hold circuits, but those things can't be changed on-the-fly in your HDL code.

So "1", "0" and "Z" (output driver off) it is...
 

YOu'd better check it in each fpga's datasheet.
 

there are no any other state.

best regards






FPGAs said:
i konw there are 1,0,and z.

any more?

thanks!
Click to expand...
 

i think there are only three kinds : 0 ,1 and z. by the way , tristate is used in top design files in Altera's FPGA.
 

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