i.MX6SL eMMC design

[alyssawu]

Dear expert,

In i.MX6SL platform, we use eMMC for data storage. Do we need the pull-up resistors at the datas (data0 to 7) and CMD signal?

thanks,

Br,

Alyssa

[Yuri · Accepted solution]

  There is no special requirement for external resistors pulling up regarding
the i.MX6 SL  eMMC interface. You may look at the i.MX6 SL EVK design schematic.

According to JEDEC specs :
“JEDEC eMMC includes internal pull-up resistors for data lines DAT[7:1]. Immediately
after entering the 4-bit mode, the device disconnects the internal pull-up resistors on the
DAT1 and DAT2 lines. (The DAT3 line internal pull-up is left connected.) Upon entering the 8-bit
mode, the device disconnects the internal pull-ups on the DAT1, DAT2, and DAT[7:4] lines.”

Have a great day,
Yuri

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[alyssawu]

Hi Yuri,

You mean that there is no need to add the pull-up resistor?

I will delete the resistor。

Thanks

[Yuri]

Yes.

~Yuri.

[alyssawu]

Hi Yuri,

In i.MX6SL platform, we use eMMC boot.

How do we set the boot_config1/2/4?

Thanks ,

alyssa:smileyconfused:

[Yuri]

   Please refer to Chapter 8 (System Boot) of the i.MX6 SL
Reference Manual.

    In particular, please pay attention on the next :
Table 8-11 (USDHC Boot eFUSE Descriptions) ;
Table 8-14 (SD/MMC IOMUX Pin Configuration).

~Yuri.