• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 33 subscribers
  • Views 1315 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB954-Q1: Questions regarding the DS90UB954-Q1

Shlomi Yehezkia
Mastermind 6150 points
Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: DS90UB953-Q1EVM

Hi Team,

I started the design with the DSUB954-Q1 and have some questions:

  1. I would like to keep the flexibility of connecting more than one camera (1,2,4 data lanes) - what is the recommendation regarding the "leave unused lanes NC? is it SW configurable to ignore unused lanes? (the lanes go into a processor)
  2. Can you please provide the schematic and layout files for the DS90UB954-Q1-EVM? The orcad version would be great, but a PDF version also helps as long as I can search within the document
  3. Can I send my schematic for review?
  4. In the early stages of my development I plan to transfer between the 954 -->953 only the control signals (GPIOs) and I2C, and not video (external camera to the board), how is this configurable through the 954?
  5. Why is there an option to select either a LDO or DC2DC on board?

 

Thanks,

Shlomi

 

  • 0
    TI__Genius 11340 points

    Hi Shlomi,

    1. You should be able to route all four lanes and change the number of CSI-lane output from register 0x33.

    2. The EVM schematic & layout are in the end of the DS90UB954-Q1 User's Guide.

    3. Yes. We can do schematic reviews.

    4. You can read the datasheets to get a better understanding of how to send I2Cs and GPIOs, but here's a general guideline:

        To talk to the DS90UB953 registers from the DS90UB954 via I2C, set the correct back channel frequency from reg 0x58 and RX port in reg 0x4C.

        To send GPIO:

    On Serializer side:

    - 0x0F (GPIO INPUT ENABLE) to select which GPIOs should be inputs and which should be outputs

    - 0x33 (Remote Enable): choose the number of GPIOs needs to be enabled

            On Deserializer side:

    - 0x0F (GPIO_INPUT_CTRL): choose enable/disable GPIO inputs

    - 0x10 - 0x16 (GPIO_PIN_CTRL): choose enable/disable GPIO outputs, from what port, and from which SER GPIO

    - 0x59 (DATAPATH_CTL1): verify how many GPIOs you are using

    5. The 5V LDO is there in case the 5V switcher causes spurious noise.

  • 0 in reply to Jiashow Ho
    Mastermind 6150 points

    Hi,

    Please see my feedback in red:

    The EVM schematic & layout are in the end of theDS90UB954-Q1 User's Guide<http://www.ti.com/lit/ug/snlu223/snlu223.pdf>. - I can not search in those schematics since it is a print screen pasted on a PDF - can you pls send the scheme and layout

    3. Yes. We can do schematic reviews.

    4. You can read the datasheets to get a better understanding of how to send I2Cs and GPIOs, but here's a general guideline: is it also the case when sending ONLY I2C and GPIO without video stream?

        To talk to the DS90UB953 registers from the DS90UB954 via I2C, set the correct back channel frequency from reg 0x58 and RX port in reg 0x4C.

        To send GPIO:

    On Serializer side:

    - 0x0F (GPIO INPUT ENABLE) to select which GPIOs should be inputs and which should be outputs

    - 0x33 (Remote Enable): choose the number of GPIOs needs to be enabled

            On Deserializer side:

    - 0x0F (GPIO_INPUT_CTRL): choose enable/disable GPIO inputs

    - 0x10 - 0x16 (GPIO_PIN_CTRL): choose enable/disable GPIO outputs, from what port, and from which SER GPIO

    - 0x59 (DATAPATH_CTL1): verify how many GPIOs you are using

    5. The 5V LDO is there in case the 5V switcher causes spurious noise. and does it?

    Thanks,

    Shlomi

  • 0 in reply to Shlomi Yehezkia
    TI__Genius 11340 points

    Hi Shlomi,

    Refer to my answers below:

    The EVM schematic & layout are in the end of theDS90UB954-Q1 User's Guide<http://www.ti.com/lit/ug/snlu223/snlu223.pdf>. - I can not search in those schematics since it is a print screen pasted on a PDF - can you pls send the scheme and layout: 

    HSDC007_REVA_EVM.pdf

    You can read the datasheets to get a better understanding of how to send I2Cs and GPIOs, but here's a general guideline: is it also the case when sending ONLY I2C and GPIO without video stream? Yes. The registers to configure to send I2C and GPIO data are independent from the video stream.

     
    The 5V LDO is there in case the 5V switcher causes spurious noise. and does it? TI switchers are CISPR-25 and auto qualified so spurious noise is not as much of a concern. 

    Best,

    Jiashow

  • 0 in reply to Jiashow Ho
    Mastermind 6150 points
    Hi Jiashow,

    Can I also get the PDF of the scheme for the DS90UB953-Q1EVM?

    Thanks,
    Shlomi
  • 0 in reply to Shlomi Yehezkia
    TI__Genius 11340 points

    Hi Shlomi,

    The schematics from the DS90UB953 User's Guide is searchable.

    Best,

    Jiashow