External Memory Interface Handbook Volume 2: Design Guidelines: For UniPHY-based Device Families

ID 683385
Date 3/06/2023
Document Table of Contents
Give Feedback

2.1.5. Dynamic OCT in Stratix V Devices

Stratix V devices also support the dynamic OCT feature and provide more flexibility. Stratix V OCT calibration uses one RZQ pin that exists in every OCT block.

You can use any one of the following as a reference resistor on the RZQ pin to implement different OCT values:

  • 240-ohm reference resistor—to implement RS OCT of 34-ohm, 40-ohm, 48-ohm, 60-ohm, and 80-ohm; and RT OCT resistance of 20-ohm, 30-ohm, 40-ohm, and 120-ohm
  • 100-ohm reference resistor—to implement RS OCT of 25-ohm and 50-ohm; and RT OCT resistance of 50-ohm

For detailed information about the dynamic OCT feature in the Stratix V FPGA, refer to the I/O Features in Stratix V Devices chapter in volume 1 of the Stratix V Device Handbook.