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TMDS1204: TMDS1204 6Gbps works but 8Gbps not work

Part Number: TMDS1204
Other Parts Discussed in Thread: TPD4E02B04

Tool/software:

We have some issues debugging tmds1204. Below is (HDMI Receptacle to TMDS 1204) and Layout(TOP layer/L2-GND)

PCB Layout

PCB Layout

MODE = “R” ;  SCL/CFG = “0” ;  SDA/CFG1 =”0”;   AC_EN =”H” ;  LINEAR_EN = “F”;

RX:  DCGAIN = “F or 1” ; CTLMAP = “0 or F”;  EQ =”F0 to 11”;

TX:  TXPRE = “F”;  TXSWG = “F”’

 

  1. TMDS-6G  EQ=”F0 to 11” OK;   SIGDET_OUT = 0V;
  2. FRL-8G/10G/12G  Failed;      SIGDET_OUT = 0~3.3V;
  3. Remove ESD (TPD4E02B04) , CTLMAP =”F”,  FRL-8G/10G/12G Failed;                   SIGDET_OUT = 0~3.3V;
  4. Remove ESD (TPD4E02B04) , CTLMAP =”0”,  FRL-8G OK/ FRL-10G/12G Failed;      SIGDET_OUT = 0(8G);
  5. HDMI Receptacle is 2086581052 Molex;
  6. Layout Impedance control 100ohm±10%;

 

Is the problem with the input signal(ESD and  0 ohm-resistor Signal integrity)?

 

Are there any other parameters that can be adjusted?

  • Hi,

    1. Please use size 0201 for the input resistor and output capacitor

    2. Please do not void the ground under the TMDS1204.

    3. Please replace TPD4E02B04 with PUSB3FR4 as TPD4E02B04 can't support HDMI2.1

    4. Please 2k pullup on LV_DDC_SCL and LV_DDC_SDA

    Thanks

    David