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TDA2EVM5777: TDA2EVM5777 DDR data pin connection

Part Number: TDA2EVM5777
Other Parts Discussed in Thread: TDA2

Hello 

Why in TDA2EVM , DDR data pin connection are not in sequence?

for example: U65 DQ15(A3) connect to DDR_D14 , DQ14(B8) connect to DDR_D9?

thank you

  • Hi,

    When interfacing TDA2 to DDR3, the DQ bits can be swapped within a byte lane to ease routing on the PCB.

    Thus, the EVM design routed DQ15(A3) to DDR_D14 and DQ14(B8) to DDR_D9 , etc. because these mappings alleviated the challenges of the PCB routing.

    Please note that DQ bit swapping can only be done within a byte lane. 

    Best regards,
    Kevin