LPC1788FBD208 support read/write 4 bit bus mode eMMC ?

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LPC1788FBD208 support read/write 4 bit bus mode eMMC ?

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thinkking1985
Contributor III

LPC1788 SDIO support:

1:Conformance to Secure Digital Memory Card Physical Layer Specification, v0.96.
2:Conformance to Multimedia Card Specification v2.11.

To my question:

1:LPC1788FBD208  SDIO controller support  4-bit bus mode's eMMC ?

2:NXP have  demo code to support read/write 4-bit bus mode's eMMC?

Thanks a lot for NXP great support.

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Alexis_A
NXP TechSupport
NXP TechSupport

Hello Alvin,

The SD module can also support eMMC memories, the module has 4 data lines so it can support 4-bit bus mode.

In the following link, you can find a driver and example package called LPCOpen, in this, you can find an example called app_sdmmc_meas that shows how to configure the module.

Best Regards,

Alexis Andalon

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thinkking1985
Contributor III

Why is it not successful to set the bus width to 4bit in MMC mode? Why is it clear in the NXP official routine that the line width below MMC V4 does not support 4bit.

Tks a  lot for your support.

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Alexis_A
NXP TechSupport
NXP TechSupport

Dear thinkking1985‌,

Can you let me know where did you find that note? In the RM mention that you would need to enable the WIDEBUS in the CLOCK register:

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Best regards,

Alexis Andalon

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thinkking1985
Contributor III

Hi Alexis

I think it is not support 4bit mode .pastedImage_1.png

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Alexis_A
NXP TechSupport
NXP TechSupport

Hello Alvin,

You're totally right, the 4-bit support is only for secure digital memory card interfaces. 

Best Regards,

Alexis Andalon