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RTOS/SN75DP130: How to improve pre-emphasis over issue at SN75DP130?

Hugo Wang
Expert 1525 points
Part Number: SN75DP130

Tool/software: TI-RTOS

Hi Sir

I have a question about how to improve pre-emphasis over issue at SN75DP130?

The schematics as below and attachment. And layout trace as followings.

If you have other comments, please help to share with me. Thanks for your great support.

Docking Board Mother Board
mils 0.1 uf mils Pin Name Pin Name mils 0.1 uf mils mils 0 ohm mils Pin Name
DP connect 109.1 C117 88.43 OUT0_p DP Redriver:
SN75DP130SSRGZT		 IN0_p 138.88 C43 455.03 (Via:1) Connecter 268.94 SR35 3341.18 (Via: 2) DDI1_TXP[0] CPU
KabyLake
110.2 C116 88.43 OUT0_n IN0_n 138.96 C26 454.43 (Via:1) 269.08 SR34 3339.30 (Via: 2) DDI1_TXN[0]
106.58 C115 81.56 OUT1_p IN1_p 63.52 C40 517.21 (Via:1) 232.61 SR33 3367.49 (Via: 2) DDI1_TXP[1]
105.25 C114 82.65 OUT1_n IN1_n 63.66 C39 519.04 (Via:1) 232.34 SR32 3366.16 (Via: 2) DDI1_TXN[1]
109.87 C113 81.13 OUT2_p IN2_p 66.13 C38 405.34 (Via:1) 216.78 SR31 3393.70 (Via: 2) DDI1_TXP[2]
109.04 C112 81.95 OUT2_n IN2_n 66.02 C37 404.14 (Via:1) 216.04 SR30 3394.27  (Via: 2) DDI1_TXN[2]
114.67 C111 87.73 OUT3_p IN3_p 68.59 C36 475.87 (Via:1) 229.71 SR29 3596.13  (Via: 2) DDI1_TXP[3]
112.47 C110 89 OUT3_n IN3_n 69.14 C35 475.97 (Via:1) 229.36 SR28 3599.24  (Via: 2) DDI1_TXN[3]
mils
1052.91 AUX_SNKp AUX_SRCp 201.09 C81 862.95 (Via:2, stub:29.76 mils) 473.66 R13 3407.88 (Via: 2) DDI1_AUXP
1051.98 AUX_SNKn AUX_SRCn 201.77 C74 860.99 (Via:2, stub:29.36 mils) 473.43 R14 3409.11 (Via: 2) DDI1_AUXN

AX93190A10_P6.pdf

  • 0
    TI__Expert 5455 points
    Hello Wang

    The pre-emphasis can be adjusted by the I2C interface and a good test to figure out a good level is an eye diagram. It depends on the application, position, traces, cables, etc.
    I let you some comments about your schematic.

    - Pull-ups resistors for SCL/SDA_CTL have to be 2K but if 4.7K are required by SMBus, is ok.
    - In case of VDDD_REG is only necessary one 1uF cap to GND.
    - But in case of Vcc is necessary one 1.uF on each power pin and one bulky cap to DP130.
    - In case of ADDR pull-up/down resistors have to be of 4.7K

    Regards
    Francisco