Re: [Mspgcc-users] Re: MMC

[r f <no...@we...>]

Hi,

>> This is from MMCProdMn_5.1.pdf (sandisk):
>>
>> "MultiMediaCards do a read after write under margin conditions to verify
>> that the data is written correctly. In the rare case that a bit is 
>> found to
>> be defective, MultiMediaCards replace this bad bit with a spare bit 
>> within ...
>
> This is contrary to EVERYTHING I know about MMC cards, and my 
> experiences with them.  

You are mixing two differend things: a) the transistor logic which is 
reading/writing bytes with an internall ECC logic and spare space and b) 
the communication of the MMC with the controller outside.
The read after write is only done from the internal controller and not 
visible outside the MMC.

Regards

Rolf F.