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DS90UB914 issue

Patrick Chen
Mastermind 8875 points


Hello,

             Customer refer to FPD-Link reference do a 914 Deserializer board that is connect to camera board with 913. But the communication are not successful between 913 and 914. Lock and Pass pin are always Hi/Lo and can't keep already normal high. But use the same camera board, register setting and cable with 914 EVM. That works normal between 914 EVM and 913 camera board. 

             Do you have any comments to solve this issue? Thank you. 

BR

Patrick

  • 0
    Prodigy 100 points

    hi patrick,

    as u said , lock is high, it indicates that link is established.

    First do a dummy write into DES, now u probe Pass, it will be high.
    Try to read auto loaded slave address from DES and SER.... to ensure that link is fine.

    Also tell me ..how many master/slave devices connected to ur i2c line.

    BISTEN is default kept high in ur schematic.  Make it low initially and then u can go for BIST mode if u want.  As u don't have switch options, hardwired it externally.

    Regards
    S.Muthukumar

  • 0 in reply to Muthukumar S
    Mastermind 8875 points

    Hello Muthukumar,

                    Thanks. 

    1. First do a dummy write into DES, now u probe Pass, it will be high.
    Try to read auto loaded slave address from DES and SER.... to ensure that link is fine.

    Ans: DES is ok for dummy write. But SER and DES link is not ok and PASS/LOCK already Hi and Lo. TI EVM is ok for DES/SER link. But customer board can't access SER via DES.

    2.  I2C bus as follows.one master and seven slave to control

                  Do you have any comments for the root cause used by customer board (DES) to fail control SER ? Thank you.

    BR

    Patrick

  • 0 in reply to Patrick Chen
    Prodigy 100 points

    Dear Patrick,

    please send me both ser-des schemtic, i will look into it .

    Regards

    S.Muthukumar

  • 0 in reply to Muthukumar S
    Mastermind 8875 points

    Dear Muthukumar,

                       please refer to below schematics of 914 on customer board. 913 is on camera board for customer outsourcing. Thank you. 

  • 0 in reply to Patrick Chen
    Prodigy 100 points
    Dear patrick,

    As per schematic, everything is ok.

    u have used IO's at 3.3V and rest at 1.8V.
    i assume that i2c pull-ups will be at Master microcontroller and CAM1_DN input connected at PDB is high, am i right?

    Please check/do the following:
    1. Keep your cameras at reset or pdwn mode
    2. Ensure PDB is high.
    3. After power on, within few milliseconds lock should be high, indicates link is established. but you have mentioned lock as low......isn't it?
    4. if lock is high, do dummy write in Des(say setting ser alias) first then read auto-loaded Ser address in des register. if u are able to read then ser link is fine.
    5. By default Ser-Des is in pass through mode, but please check its register to confirm the same.
    6. Set ser alias in Des and try for i2c commm to Ser using alias address.

    mail me what u observe?

    Mostly i2c communication(back channel comm) is established without any issues.

    many users find issues over data signal(forward channel comm) transmission in their custom board.
    Still i too have this issue....it works well if we integrate with EVM but not in our custom board.....for this issue , u will never get any reply from TI engineer......

    regards
    S.Muthukumar