Some UHS card cannot work on imx8-evk

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Some UHS card cannot work on imx8-evk

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Contributor II

Dear sir,

We found some UHS card cannot work in SDR104 on imx8-evk. Sometimes tuning failed, sometimes not command response from card after tuing. All card work OK in high speed mode. We want to know your UHS card test results on imx8-evk.

Below information is from TI for your reference. Do you have similar testing information to share?

http://processors.wiki.ti.com/index.php/Linux_Core_MMC/SD_User%27s_Guide#Testing_Information

Testing Information

FUNCTIONAL UHS CARDS
STRONTIUM NITRO 466x UHS CARD
SANDISK EXTREME UHS CARD
SANDISK ULTRA UHS CARD
SAMSUNG EVO+ UHS CARD
SAMSUNG EVO UHS CARD
KINGSTON UHS CARD (DDR mode)
TRANSCEND PREMIUM 400X UHS CARD (Non fatal error and then it re-enumerates in UHS mode)
FUNCTIONAL (WITH LIMITED CAPABILITY) UHS CARD
SONY UHS CARD - Voltage switching fails and enumerates in high speed
GSKILL UHS CARD - Voltage switching fails and enumerates in high speed
PATRIOT 8G UHS CARD - Voltage switching fails and enumerates in high speed

Best regards,

Miles

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48 Views
NXP TechSupport
NXP TechSupport

Hi Miles

unfortunately I am not aware of such testing informatio, however

tuning failures usually are caused by signal integrity, which may be improved

by adjusting drive strength, for example using sect.8.2.4.192 SW_PAD_CTL_PAD_SD1_

DATA0 SW PAD Control Register (IOMUXC_SW_PAD_CTL_PAD_SD1_DATA0)

i.MX8MDQ Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMX8MDQLQRM.pdf

Note SD drive strength also can be changed, it is described in sect.6.7 Driver Strength

and Bus Timing for 1.8V Signaling SD 3.0 Physical Layer Specification.

Best regards
igor
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Contributor II

Thanks,

Current configurations as below:

IOMUXC_SW_PAD_CTL_PAD_SD2_CLK = 0x87

IOMUXC_SW_PAD_CTL_PAD_SD2_CMD = 0xc7

IOMUXC_SW_PAD_CTL_PAD_SD2_DATA0-4 = 0xc7

current limit = 800mA

driver strength = TypeB (default)

Is it OK?

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48 Views
NXP TechSupport
NXP TechSupport

settings may depend on used sd card, suggest to check waveforms and signal timings

with oscilloscope with each card and adjust iomux settings accordingly.

Best regards
igor

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