10.1.5.3.2 DDR Voltage Reference
The DDR_VREF pin serves as a voltage reference input for the DDR I/Os when DDR2, DDR3 or DDR3L external SDRAM memories are used.
The DDR_VREF pin serves as a voltage reference input for the DDR I/Os when DDR2, DDR3 or DDR3L external SDRAM memories are used.
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