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DDR frequency in AM335x - BBB

Dear Ti E2E Community,

Am using ti sdk 7 , I am scaling the CPU frequency from 1GHz to 300 MHz , In beaglebone black the DDR frequency is 400MHz, when CPU frequency is 1 GHz,

Could you please let me know what is DDR frequency????? after scaling the CPU frequency from 1Ghz to 300 Mhz, or does ddr freq remains same (ie., 400Mhz)?????, after scaling the cpu freq from 1Ghz to 300Mhz

Kindly do the needful as this is required for DDR initial analysis as early as possible,

Awaiting for your replies,

Many Thanks in advance