What is the Ref clock provided to the FPGA EMIF? And the clock rate of the DDR?

The Ref clock provided to the FPGA EMIF is 200MHz, this is to support a maximum Memory clock frequency of 1600MHz.
DDR supports a clock rate of 1600MHz.

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Agilex™ 7 (R31A/R31B/R31C) SoC FPGA System on Module