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Initializing SD Card in SD bus mode

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cube007

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Hello,

For getting the best performance I would like to implement a SD card IP within an FPGA which communicates with a SD Card in SD bus mode. As far as I know the first steps are as follows:

1. Send command CMD55
2. Send command ACMD41 with OCR data
3. Wait for response to the ACMD41 command

After sending CMD55 and ACMD41 I get no response from the card. The card works fine in my PC so I think the protocol machine fails. Now I need a detailed description of the initialization process. It’s also possible that I’m calculating the CRC not correct. Dou you have some examples or deep information for me?


Bye,
cube007
 

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