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The AM64x and AM243x processors support two different types of DDR memories: DDR4 and LPDDR4. This allows customer board designs to be implemented with the memory type that best meets their target market at the lowest possible DDR SDRAM cost. This document is divided into three sections. The first section contains material applicable to board designs containing either of the DDR SDRAM memory types. This is followed by sections containing information specific to each of the DDR memory types.