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