CPU address to OCM address translation

How exactly does the address translate to an OCM address? I can't really find anything solid on the matter and I looked at the values of the DSARC register and but I couldn't really find any connection between that value and my CPU OCM addresses. I know the upper 8 bits are not used, bit I didn't understand why the lower 2 bits are discarded, is this for 32 bit alignment?

Thanks in advance

Jim

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