Re: [sigrok-devel] emmc - dat0

[Helge K. <Hel...@gm...>]

Hello Adam,

The SD-card decoder defines optional input signals for D0..D3 but does 
not evaluate the data at these lines.

I once had a problem where I had to interpret the data on D0..D3. To do 
this, I wrote an extension to the SD card decoder that also displays the 
data in 4-bit mode.
I also performed the CRC check. My host controller reported CRC errors 
and I just wanted to know whether the problem was caused by the data or 
whether there was another issue.

This extension was only experimental. The problem was that the length of 
the data block is not always clear. In addition to the typical 512-byte 
data blocks, I also have 64-byte blocks with statistical data. 
Predicting the respective block length has not always been clear.


Are you interested in trying this out?

Regards
Helge

*Subject:* [sigrok-devel] emmc - dat0

*Date:* Monday, February 9, 2026 at 21:42 UTC+1

*From:* Adam Sulmicki <sul...@gm...>

*To:* sig...@li...


> Hello,
>
> I wanted to ask how does situation with support for decoding dat0 line 
> looks like?
>
> Using SD card (SD mode) , I see the CMD line seems to be decoded fine 
> for emmc data.
>
> It is just support for dat0 (1 bit mode) decode seems to be missing.
>
> Sincerely,
> Adam Sulmicki
>
>
>
>
>
>
>
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