AM6442: For DDR4 using,when use inline ECC,why cannot swap bit.

The CRC logic will have no knowledge of the physical swapping of the data on the board, so the CRC will be incorrect.  We do have inline ECC in the DDR subsystem which would work with data swapping.

Regards,

James

We are functional safety application and using ECC for DDR4.Can we swapping data? What is the difference between CRC and ECC?

Cyclic Redundancy Check, both sender/receiver perform a calculation on the data to generate the CRC, which is transmitted and checked at the receiver end to check data validity

Error Correcting Code:  extra information stored with the data to detect and potentially correct data errors.

CRC can only detect errors, while ECC can correct single bit errors.

Regards,

James

Thanks for your reply.

Our application is using only ECC.Since we have swapped data,Can we configure not to use CRC to aviod report error.

CRC is disabled by default in the DDR Register Configuration Tool

Regards,

James