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I would like to interface a Cyclone IV FPGA with a component that uses 1.3V-LVCMOS. However, the FPGA IO standards are either 1.2V or 1.5V. Is it possible to connect the Vccio pins to 1.3V? If it's possible, should I set the IO standard in the Quartus software to 1.2V or 1.5V?
Thanks for your support.
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Look at the compatibility of the interfaces:
1) Does FPGA output Vol(max) and Voh(min) meet the input requirement of the external 1.3V logic device.
2) Does the 1.3V device output Vol(max) and Voh(min) meet the input requirement of the FPGA device.
3) Do any voltages violate the maximum input voltage of either device.
Chances are the 1.2V FPGA standard will work fine (the FPGA pins could handle 1.3V input from the external device).
Don't forget that setting the voltage in Quartus is not sufficient, the board itself has to actually have a VCCIO voltage of 1.2V :)
Cheers,
Dave
Honored Contributor
