topic Re: K64 SDHC interface with emmc device in Kinetis Microcontrollers

K64 SDHC interface with emmc device

JHinkle — Thu, 13 Dec 2018 19:06:08 GMT

The K64's SDHC states that it is compliant with MMC System Specification 4.2/4.3

I am looking into interfacing the K64's SDHC with a emmc device meeting specification 5.1.

I would like to use the 8 bit data interface.

I have not been able to find any information as to interfacing a 5.1 device with a 4.3 version controller.

Can this be done?

What are the pro/cons associated with an "old" SDHC controller mating with the latest emmc devices.

Thanks in advance for any replies.

Joe

Re: K64 SDHC interface with emmc device

Hui_Ma — Mon, 24 Dec 2018 03:14:52 GMT

Hi Joe,

First of all, sorry for the later reply.

Could you check the eMMC card manufacturer specifications to see if the card is backwards compatible with previous versions?

Thanks for the attention.

Have a great day,
Mike

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Re: K64 SDHC interface with emmc device

JHinkle — Thu, 27 Dec 2018 16:15:02 GMT

Hi Mike:

Trying to get an App Engineer from Western Digital to answer a question is impossible.

I found an NXP i.MX6 mcu that had a similar question asked and the post stated that the SDK driver needed to be changed but it could be used (the NXP mcu supported 4.4 when the K64 supports specifications 4.2/4.3)

https://community.nxp.com/docs/DOC-332187

I was hoping to get some assurance that the K64 will perform properly before I go to the effort and expense of turning a new board to test it.

I do not believe there will be an issue of sector read or write.

I was hoping the K64 supported the "trim" and "Bad Sector Management" capabilities associated with the emmc device.

Do you know if that is possible?

Thanks.

Joe

Re: K64 SDHC interface with emmc device

Hui_Ma — Sat, 29 Dec 2018 02:50:47 GMT

Hi Joe,

I don't find K64 SDHC module support "trim" and "Bad Sector Management" capabilities.

I think K64 couldn't support those features.

best regards,

Mike