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

ID 683385
Date 3/06/2023
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2.1.3.1. FPGA Writing to Memory

The benefit of using dynamic series OCT is that when driver is driving the transmission line, it “sees” a matched transmission line with no external resistor termination.

The following figure shows dynamic series OCT scheme when the FPGA is writing to the memory.

Figure 13. Dynamic Series OCT Scheme with ODT on the Memory

Refer to the memory vendors when determining the over- and undershoot. They typically specify a maximum limit on the input voltage to prevent reliability issues.