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DS90UB913A-Q1: 913 and 914 can shake hands and communicate, and the Lock signal is normal but the video transmission is abnormal

Part Number: DS90UB913A-Q1

Hi team,

Could you please help for this issue?

1. There is a very low probability that 913 and 914 can shake hands and communicate, and the Lock signal is normal but the video transmission is abnormal.
2. The value of register 0x05 is read when it is abnormal (the value is also 0x14 when it is normal)
3. After resetting the 914 chip, the fault remains.
4. Reset the 913 chip to return to normal.
5. After rewriting the register 0x05=0x21, the video transmission can return to normal.
6. The probability of failure of the faulty parts is very high at room temperature, and the probability is very low at -40 degrees, and the high temperature of 85 degrees hardly appears.
7. The hardware tests the power, clock, reset and other signals without any abnormalities.

  • Hi Amelie, 

    The register 0x05, is this on DES or SER? What do you mean by low probability of the devices communicating? Are you saying that there are I2C errors? 

    What mode are you using - coax/STP, 10 bit/12 bit, clock from imager/external clock, etc.? What errors are you seeing?

    Thanks ,
    Sally 

  • Hi Sally,

    The 0x05 here, means 913's register. coax,10 bit, external clock

    I talked  to customer and found the problem.

    Customer's HW of mode select is  Pin_MODE_ 10–bit mode=1, which means 0x05=0x14

    However, it seems that the HW mode select doesn't work. When power-up, 913 couldn't work as the default. It seems it lost the filed and line signal.

    Only after use software to rewrite the 0x05=0x21 to select 10-bit mode again, 913 work as the correct mode.

    So the question is when initializating, 913 couldn't work as the default mode 10-bit mode. How could we solve the problem? I found the res in mode select pin, it is correct and no problem. Is it the timing issue?

  • Hi Amelie, 

    Can the customer probe his mode select pin and make sure he is within our limits? Maybe the resistor tolerance is not correct and his voltage is not what he is expecting. Also the mode setting for 10/12 bit is on the DES side, so make sure you check the 914; please see section 9.4.3 MODE Pin on Deserializer. 

    THanks, 

    Sally 

  • HI Sally,

    I found the mode pin only determine the internal and external clk and it is not determine the 10 bit and 12 bit...

    And the voltage of mode pin is also normal. 

    May I ask where customer could select the 10 bit and 12 bit?

  • Hi Amelie, 

    The mode pin they should check is on the 914A. They can read about it in section 9.4.3.

    Thanks, 

    Sally