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  1. #1
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    Why DDR3\4, DM is not used in READ operation? I can see how its works on Write but no

    Why DDR3\4, DM is not used in READ operation? I can see how its works on Write but not on read.

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  2. #2
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    Re: Why DDR3\4, DM is not used in READ operation? I can see how its works on Write bu

    For read operations, it isn't a problem to read the full memory width. The reading device can use whatever bytes it wants.
    For write operations, only the affected bytes can be written, otherwise the other bytes would be corrupted.
    This means that the DM signals are only needed for write operations.

    If the full memory width is used for all write operations, the DM signals are not needed.



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