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TDA4VM: Please double check whether TDA4VM LPDDR4 parameter is not compatible with Micron MT53D1024M32D4DT parts?

Tao Han
Expert 6165 points
Part Number: TDA4VM

Hi experts:

Customer are using simulation software hypwerlynx V2.7 simulate TDA4VM LPDDR4 Signal Integrity. At our excel parameter calculate tools the driver strength pull-up/down use 34.3 ohm.  The software SBL driver.psdk_rtos_auto_j7_07_00_00_11/pdk_jacinto_07_00_00/packages/ti/board/src/j721e_evm/include/board_ddrRegInit.h line 2224-2228 configure the driver strength is largest one.

Follow IBIS module just LPDDR4x can use 34.3 ohm pull-up/pull-down value. LPDDR4 just support 40ohm pull resistor. Customer use the same as  spracn9a.pdf page 20. (- lpddr4_ocd_40p_40n, lpddr4_ocd_40p_40n_diff)

The question is that whether TDA4VM default software LPDDR4 driver strength setting is wrong, because it do not meet LPDDR4 spec and ibis module?

Best Regards!

han tao

 

  • 0
    TI__Mastermind 34570 points

    Hi Tao,

    Apology for the delay.

    The setting shown in the XLS is what was used to test silicon; however, I do not have information regarding why 34 Ohm drive impedance is not included in the IBIS model. Will need to follow-up on this.

    Best regards,
    Kevin