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TDA2: DDR DQ signal swapping rules

Jianming Li
Prodigy 50 points
Part Number: TDA2


In the DDR2/DDR3 interface design, can we swap DQs with in the same byte? is there any rules on this?

such as dq0 swapped with dq3

dq2 with dq7, etc

Thanks

Jianming

  • 0
    TI__Mastermind 40220 points

    Hi,

    Yes, it is okay to swap DQ bits within the same byte on the TDA2x DDR2/DDR3 interface. The only rule for DQ bit swapping on the TDA2x DDR2/DDR3 interface is that the DQ bits must be routed with their associated strobe (DQS) and mask (DM). (i.e, all signals within a byte of the TDA2x must be routed to the same byte of the DDR2/3 memory).

    Best regards,
    Kevin