i.MX6SL eMMC design

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i.MX6SL eMMC design

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alyssawu
Contributor I

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

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Yuri
NXP Employee
NXP Employee

  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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Yuri
NXP Employee
NXP Employee

  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

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

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alyssawu
Contributor I

Hi Yuri,

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

I will delete the resistor。

Thanks

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Yuri
NXP Employee
NXP Employee

Yes.

~Yuri.

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alyssawu
Contributor I

Hi Yuri,

In i.MX6SL platform, we use eMMC boot.

How do we set the boot_config1/2/4?

Thanks ,

alyssa:smileyconfused:

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Yuri
NXP Employee
NXP Employee

   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.

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