Stratix II, Stratix III, Stratix IV, Arria GX, Arria II GX, and Cyclone III devices support OCT with calibration.
 
[Setting in Quartus II]
There are two methods for setting OCT with calibration.
1. Manual setting
Manually set Output Termination and Input Termination in the Assignment Editor.
2. Automatic setting
If using a DDR2 or DDR3 SDRAM High-Performance Controller, the device series
will automatically set the appropriate settings.
 
OCT with calibration is automatically set for Stratix III and Stratix IV devices.
If you want to remove this setting, you must manually edit the Assignment Editor.
When OCT with calibration is enabled, Quartus II automatically generates signals corresponding to Rpu and Rdn during compilation and assigns them to the Rpu and Rpd pins of the appropriate bank.
If the user wants to specify a new Rpu and Rdn pin in another bank, please manually reassign the Rpu and Rdn that were automatically assigned by the pin planner.
 
 
[Settings on board]
When using OCT with calibration, it is necessary to connect a 25Ω or 50Ω precision resistor to the Rpu and Rdn pins of one of the banks between Vccio and GND, respectively.
When using the DDR2 or DDR3 SDRAM High-Performance Controller in a Stratix III or Stratix IV device, 50Ω calibration is selected, so connect a 50Ω resistor to Vccio on the Rpu pin and a 50Ω resistor to Vccio on the Rdn pin. Connect a 50Ω resistor to GND.
Any bank can be used for the Rpu and Rdn pins as long as the Vccio voltage level is the same as the I/F bank.
Please refer to the device handbook for other limitations for each device series.
 
Accurate OCT is achieved by using OCT with calibration, which contributes to the improvement of signal integrity.