18.104.22.168. OCT Calibration Block in Intel® Arria® 10 Devices
You can use RS and RT OCT in the same I/O bank for different I/O standards if the I/O standards use the same VCCIO supply voltage. You cannot configure the RS OCT and the programmable current strength for the same I/O buffer.
The OCT calibration process uses the RZQ pin that is available in every calibration block in a given I/O bank for series- and parallel-calibrated termination:
- Each OCT calibration block has an external 240 Ω reference resistor associated with it through the RZQ pin.
- Connect the RZQ pin to GND through an external 100 Ω or 240 Ω resistor (depending on the RS or RT OCT value).
- The RZQ pin shares the same VCCIO supply voltage with the I/O bank where the pin is located.
- The RZQ pin is a dual-purpose I/O pin and functions as a general purpose I/O pin if you do not use the calibration circuit.
Intel® Arria® 10 devices support calibrated RS and calibrated RT OCT on all LVDS I/O pins except for dedicated configuration pins.