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AM4378: AM4378 memory interface

Conor
Guru 12165 points
Part Number: AM4378

Hi,

Two DDR3L SDRAM 8bit are connected to the memory interface of AM4378.
① Is there any problem with the processing of empty terminals as follows?
・DDR_DQS2, DDR_DQS2 → Pull up to VDDS_DDR with 1kΩ
・DDR_DQSn2, DDR_DQSn3 → Pull down to GND with 1kΩ
・DDR_D16～DDR_D31 →OPEN
・DDR_DQM2, DDR_DQM3 →OPEN
・DDR_ODT1 →OPEN

② Should I include a damping resistor in the attached red part? Could you please let me know if there is a recommended resistance value?
Also, is it better not to put anything into the wires that have been terminated (VTT termination)?

Thanks,

Conor

  • 0
    TI__Guru* 86750 points

    Conor,

    1. This is detailed in the datasheet section  5.12.8.2.1.3.1 DDR3 Interface Schematic

    2.  Your schematic should reflect the block diagram from the datasheet.  No damping resistors are necessary

    Regards,

    James