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SERDESUB-16USB no PCLK on serializer side

Dang Tr
Prodigy 60 points

Hi,

I have the SERDESUB-16USB dev boards and I'm trying to communicate with a remote I2C slave without any success. The SERDESUB-16USB boards are configured in camera mode.

My question is, am I suppose to get a PCLK (25Mhz) on the Serializer side? Because I'm not getting a PCLK on the Serializer side. I am get a 25Mhz PCLK on the Deserializer.

  • 0
    TI__Prodigy 175 points

    Hi

    You will get the PCLK on the Deserializer side and not the Serializer side. Dac Tran is the applications engineer responsible for this chipset and he can help with remote I2C communication.

    Regards,

    Raj

  • 0 in reply to Amritraj Khattoi
    TI__Expert 7395 points

    Hi Dang Tr,

    There is an internal 25MHz oscillator on the Serializer. However, the 25MHz cannot be accessed directly and will be serialized by 28*PCLK onto the FPD-Link III data stream.

    In camera mode, by default the Serializer is in a low-power Standby mode. The Deserializer requires a remote wake-up from Deserializer before starting any transmission. Please see DS90UB901/2 datasheet section for REMOTE WAKE UP (Camera Mode) procedure on pages 36-37.

    http://www.ti.com/lit/gpn/DS90UB901Q-Q1

    Dac Tran

    SVA / APPS

  • 0 in reply to Dac Tran
    Prodigy 60 points

    Dac,

    I implemented the REMOTE WAKE UP but I'm still not get a PCLK on the serializer side. Is it necessary to have PCLK on the serializer side in order to talk with remote I2C slave? I'm only trying to communicate with a remote I2C slave (a temperature sensor).

    From that Data sheet PCLK is an input. Also, from the SERDESUB-16USB User's Guild (snlu100.pdf) it said "The user needs to provide the proper 1.8V/3.3V LVCMOS inputs and 1.8V/3.3V LVCMOS
    clock to the Serializer". Please confirm that there is a internal 25MHz oscillator on the Serializer?

    Thank

    Dang

  • 0 in reply to Dang Tr
    TI__Expert 7395 points

    Hi Dang,

    The remote I2C link requires both the Serializer and Deserializer chipsets. On the Serializer side, the PCLK is an input only signal. If there is no valid PCLK input on the Serializer, it will automatically switch over to the internal 25MHz oscillator (following the remote wake sequence). Validate the Deserializer Lock pin is High before starting any I2C communication across the link.

    "The user needs to provide the proper 1.8V/3.3V LVCMOS inputs and 1.8V/3.3V LVCMOS clock to the Serializer" description in user manual refers to data transmission of the serdes interface to test equipment in order to check device functionality. However, the I2C communication does not require a PCLK input to work.

    Dac Tran

    SVA / APPS