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TFP410 display issue

Sudheesh
Expert 1945 points
Other Parts Discussed in Thread: TFP410

 Hi,

We are using TFP410 in one of our boards. We are not able to get it to work. Following are our observations.

1. Register dump of TFP410 after poweron :

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef        

00: 4c 01 10 04 00 00 14 64 be 80 80 00 a9 db 97 22    L???..?d???.???"         

10: 00 00 00 00 00 22 e1 5f ac b2 5c 48 41 00 00 00    ....."?_??\HA...

 

2. Before using it, we are writing the following values to TFp410:

        ./i2cset -y 0 0x38 0x8 0xbf                                                     

        ./i2cset -y 0 0x38 0x9 0xb6   

 

3. We are feeding RGB video to TFP410.

4. We are seeing signals in HSYNC, VSYNC and Inout data pins of TFP410 (after probing using CRO).

5. After connecting an HDMI output, 0x9 register of TFP410 shows the following value : 0xb4

   According to this, the RSEN bit is set. This means that "A powered-on receiver is detected" by TFP410

6. But we are not seeing (after probing) any output signal on TFP410.

 

Kindly tell me if I am missing anything here.

Regards

tvs

  • 0
    TI__Mastermind 43875 points

    I recommend you use the TFP410 in slave mode since this requires no configuration at all of the TFP410.

    This is achieved by holding ISEL/RTSb low.

    In this mode all the timing is generated by the processor and there is no need to synchronize nor configure the TFP410.

    You may also want to check the TFADJ resistor value.

    BR,

    Steve