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TDA4VM: The emmc cannot be recognized

Ruifeng Zhang
Intellectual 570 points
Part Number: TDA4VM


Hi,

The emmc can't work when designed as following:

But it works when add a 0 ohm resistance or a 10 pF capacitance to CMD, as following:

My question is whether there are registers that can be used to replace 0 ohm resistors or 10 pF capacitors, so that CMD delays CLK.

  • +1
    TI__Genius 10180 points

    Ruifeng,

    The MMCSD0_SS_PHY_CTRL_4_REG bit field [15:12] can be used to modify TX Clock timing.  This register should be programmed to the value specified in corresponding device data manual based on the expected speed mode.  Has this been done?

    Best Regards,

    Shiou Mei