MMC 8-Bit

patrick nefos

Expert 1850 points

Does your MMC driver support MMC 8 bit mode?

If not is it planned? I need best transfer speed possible for my design.

Patrick

0 BrandonAzbell over 13 years ago

patrick nefos said:

Does your MMC driver support MMC 8 bit mode?

Only 4-bit mode is supported.

patrick nefos said:

If not is it planned? I need best transfer speed possible for my design.

I don't have that information.

0 Renjith Thomas over 13 years ago in reply to BrandonAzbell

Guru 31670 points

Brandon,

Are you still looking for 8-bit support?

0 patrick nefos over 13 years ago in reply to Renjith Thomas

Expert 1850 points

Hi Brandon,

We are considering 8-bit for faster transfers, only if we do not bring the card out to the user (internal only)

On previous DM6441 design, we used CF card behind a sealed door that sometimes the user did not close properly.

Our unit is IP67 so we are considering internal only for sealing purposes.

Patrick

0 Renjith Thomas over 13 years ago in reply to patrick nefos

Guru 31670 points

Patrick,

Are you considering eMMC for this?

0 patrick nefos over 13 years ago in reply to Renjith Thomas

Expert 1850 points

I am thinking iNAND eMMC 4.3 but not sure of DM814x support. The TRM discusses at 4.7.4.2.

Have you tried this?

Patrick

0 Renjith Thomas over 13 years ago in reply to patrick nefos

Guru 31670 points

Patrick,

In section 18.1.2 its mentioned that its supported.

Full compliance with MMC command/response sets as defined in the Multimedia Card System Specification, v4.3.

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