eMMc JEDEC version 5.1

Hello Surojit,

Are you using this eMMC as the extension of the flash memory?

S7G2 is the 32-bit MCU, so the maximum addressable space is limited with 4 GB, maybe that's the reason.

Kind regards,

Sergey

If this response, or one provided by another user, answers your question, please verify the answer. Thank you!

Renesas Engineering Community Moderator
https://community.renesas.com/
https://academy.renesas.com/
https://en-support.renesas.com/knowledgeBase/

Hi Sergey,

Thank You for your prompt reply.

We are not using eMMC as flash memory,

It is used with FileX to store data as an external Media,

We have tested with 16GB SD-Card and it works fine.

4 GB eMMC works fine but 16GB eMMC is not working.

Regards,

Surojit

Hello Surojit,

According to the S7G2 Hardware User's Manual, "The MMC interface supports 1-bit, 4-bit, and 8-bit MMC buses that provide eMMC 4.51 (JEDEC Standard JESD 84-B451) device access. This interface also provides backward compatibility and supports for high-speed SDR transfer modes." (https://www.renesas.com/us/en/document/man/s7g2-microcontroller-group-users-manual?r=1054631#G47.2512524)

So probably, it just doesn't support the later JEDEC version.

Kind regards,

Sergey

If this response, or one provided by another user, answers your question, please verify the answer. Thank you!

Renesas Engineering Community Moderator
https://community.renesas.com/
https://academy.renesas.com/
https://en-support.renesas.com/knowledgeBase/

Hi Sergey,

We need to use a 16GB eMMC can you suggest any work around?

Thank You,

Regards,

Surojit

Hi Sergey,

Since eMMC 5.0+ is being used globally by the vendors, the SSP must be updated to support the same,

It is the need of the hour,

Please Contact your Development Team.

Do keep me posted.

Thank You,

Regards,

Surojit.

Hello Surojit,

Sure, I'll contact them and will keep you updated.

Kind regards,

Sergey

If this response, or one provided by another user, answers your question, please verify the answer. Thank you!

Renesas Engineering Community Moderator
https://community.renesas.com/
https://academy.renesas.com/
https://en-support.renesas.com/knowledgeBase/

Hi Sergey,

Thank you for treating this as urgent.

Regards,

Surojit.

Hi Sergey,

Please share about any development regarding this issue.

Regards,

Surojit

If your need is urgent, you should be able to init you eMMC in an earlier, pre-5.1 mode and use the existing driver. Check your datasheet and the HAL layer documentation.

Hi larry,

We have checked the datasheets and no such option is available.

Regards,

Surojit

You should talk to the part vendor - my understanding is that if the driver only uses jedec 4.52 features, a 5.0 part should work.  Or you could add the jedec 5.0 support yourself - the vendor may have a block driver, or you could mod the one from the linux tree for ThreadX.  So what doesn't work? Can you ID the part, check size, etc? Something must work unless the connection is different

You should talk to the part vendor - my understanding is that if the driver only uses jedec 4.52 features, a 5.0 part should work.  Or you could add the jedec 5.0 support yourself - the vendor may have a block driver, or you could mod the one from the linux tree for ThreadX.  So what doesn't work? Can you ID the part, check size, etc? Something must work unless the connection is different

Suggest leaving DS disconnected

discuss.96boards.org/.../3390

Hi Larry,

None of the vendors are providing 8Gb or more capacity for eMMC which can be used with an older version than 5.1

Regards,

Surojit

Sorry, I meant 5.1 in my post. A 5.1 eMMC should work with an old controller cpu. Leave DS disconnected.

Are any of the command I mentioned working?

Larry

Hi Larry,

I will try this and get back to you soon,

Appreciate your help in the matter.

Thank You,

Regards,

Surojit.

Hi,

DS is not connected still we are not getting anything like ID and storage details etc.

Regards,

Surojit