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TDA4VM-Q1: Pin dealy

Nancy Wang
Expert 8210 points
Part Number: TDA4VM-Q1
Other Parts Discussed in Thread: TDA4VM

Hi,

Please help provide the internal pin dealy data of TDA4VM-Q1 for the same length of LPDDR4 layout traces.

  • +1
    TI__Guru 52695 points

    Below is the on-package pin delay for each of the LPDDR4 signals (for TDA4VM)

    Net Delay (ps)
    DDR0_ATB0 25.60
    DDR0_ATB1 36.12
    DDR0_CA0 40.47
    DDR0_CA1 40.29
    DDR0_CA2 40.53
    DDR0_CA3 42.49
    DDR0_CA4 39.76
    DDR0_CA5 41.63
    DDR0_CAL0 42.71
    DDR0_CKE0 43.19
    DDR0_CKE1 39.94
    DDR0_CKN 42.68
    DDR0_CKP 43.66
    DDR0_CSN0_0 45.43
    DDR0_CSN0_1 39.29
    DDR0_CSN1_0 47.99
    DDR0_CSN1_1 40.56
    DDR0_DM0 61.84
    DDR0_DM1 51.93
    DDR0_DM2 34.79
    DDR0_DM3 31.10
    DDR0_DQ0 62.93
    DDR0_DQ1 62.45
    DDR0_DQ2 61.75
    DDR0_DQ3 62.30
    DDR0_DQ4 61.86
    DDR0_DQ5 62.56
    DDR0_DQ6 63.94
    DDR0_DQ7 63.32
    DDR0_DQ8 52.97
    DDR0_DQ9 52.55
    DDR0_DQ10 52.84
    DDR0_DQ11 52.90
    DDR0_DQ12 50.25
    DDR0_DQ13 51.93
    DDR0_DQ14 50.69
    DDR0_DQ15 50.39
    DDR0_DQ16 32.50
    DDR0_DQ17 32.72
    DDR0_DQ18 32.28
    DDR0_DQ19 31.99
    DDR0_DQ20 34.83
    DDR0_DQ21 32.23
    DDR0_DQ22 34.58
    DDR0_DQ23 32.83
    DDR0_DQ24 31.63
    DDR0_DQ25 31.21
    DDR0_DQ26 33.99
    DDR0_DQ27 31.74
    DDR0_DQ28 30.70
    DDR0_DQ29 30.73
    DDR0_DQ30 31.07
    DDR0_DQ31 31.33
    DDR0_DQS0N 62.59
    DDR0_DQS0P 61.50
    DDR0_DQS1N 50.94
    DDR0_DQS1P 51.44
    DDR0_DQS2N 33.35
    DDR0_DQS2P 34.17
    DDR0_DQS3N 33.33
    DDR0_DQS3P 32.35
    DDR0_RESETN 42.82
    DDR_RET 39.68
  • 0
    TI__Expert 8210 points

    Hi,

    In addition to LPDDR4, please help provide the pin delay of other pins, such as SGMII，thanks！

  • 0 in reply to Nancy Wang
    TI__Guru 52695 points

    We do not have this level of data for any other pins, as the delay is small compared to the overall signal rate.

  • 0 in reply to Robert Eschler
    TI__Expert 8210 points

    The previously provided LPDDR4 pin delay data unit is ps. The customer converts it according to 1ps=5mil. It is found that the LPDDR4 isometric simulation has a huge difference. It is suspected that the conversion relationship is incorrect.

    Can you provide the following pin delay data in units of mil, or provide the conversion relationship between ps and mil in the TDA4.

  • 0 in reply to Nancy Wang
    TI__Guru 52695 points

    Pin delay cannot be provided in length (mils), as the delay is more than just trace length.  It may include other constructions like vias.  All Jacinto LPDDR4 requirements are also provided in time (ps).

  • 0 in reply to Robert Eschler
    TI__Expert 8210 points

    Can you provide the conversion relationship between PS and mil?

  • 0 in reply to Nancy Wang
    TI__Guru 52695 points

    That conversion is PCB stack-up (material) dependent, which is why TI provides the measurement in time.  For my estimations, I use 170ps per inch for standard FR4 material.  But that is an estimation only.