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AM6442: Why only emmc0 can support emmc flash

Thomas Yang55737
Expert 4986 points
Part Number: AM6442

Tool/software:

Hi Expert,

on AM64x, EMMC0 can connect to emmc flash and emmc1 can only connect to sd/sdio, as emmc don't need SDCD and SDWP, and other pins are same , though the support spec are different:

emmc0: eMMC Electrical Standard 5.1 (JESD84-B51),

sd1: SD Host Controller Standard Specification 4.10 and SD Physical Layer Specification v3.01

customer want to know why emmc1 can not connect to emmc flash, is it only caused by spec difference?

This point will impact their total system design, could you clarify? 

Thanks

Thomas

  • 0
    TI__Guru 62855 points

    Because the design team only closed timing of the MMC0 peripheral for operating with eMMC devices and only closed timing of the MMC1 peripheral for operating with SD Cards.

    Regards,
    Paul