External Memory Interface Handbook Volume 2: Design Guidelines

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ID 683385
Date 5/08/2017
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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.

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