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DS90UB954-Q1: How to write test application to generate a maximum busload on DS90UB954-Q1

Dinh Pham
Prodigy 215 points
Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: ALP

Hi Ti experts,

We're developing a test application to generate a maximum busload on DS90UB954-Q1:

This test app checks whether DS90UB954-Q1 can run with the maximum busload.

My idea is: set max resolution and max fps on camera to have the max busload this board can generate and run through the DS90UB954, this case only generates the max busload that our board can generate.

But if like this, we can not generate the max busload on the datasheet of DS90UB954

So Could you guide me:

1. What is the maximum busload of DS90UB954?

2. How to generate maximum busload on DS90UB960 De-Serializer

3. How to calculate % busload

Thank you very much in advance!

  • 0
    TI__Genius 11315 points

    Hi Dinh,

    Which serializer are you using with the DS90UB954 and DS90UB960? The main consideration is to determine whether your serializer supports the incoming camera bandwidth. The serializer datasheet will tell you the max bandwidth it supports. 

    If you use a CSI-2 serializer such as DS90UB953, the equation to calculate the CSI-2 bandwidth coming from the imager is:

    (HActive) x (VActive) x (Frame Rate) x (Data Type Bits-Per-Pixel) x Overhead (25% if unknown).

    You will need to make sure the imager bandwidth does not exceed the serializer specifications. 

    Regards,

    Cindy

  • 0 in reply to Cindy Li
    Prodigy 215 points

    This is my system:

    I use the camera with: sensor is IMX490, serializer is DS90UB953

    Do you have any example for this test app. If yes please share it, I really appreciate it!!

  • 0 in reply to Dinh Pham
    TI__Guru** 108550 points

    Hello Dinh,

    Cindy is OoO and will get back to you on Monday.

  • +1 in reply to Dinh Pham
    TI__Genius 11315 points

    Hi Dinh,

    You can run the camera at the max video bandwidth that the DS90UB953 serializer will accept (3.328Gbps) and run the MAP tool on ALP to check if the margin is sufficient. You can refer to the MAP tool user guide here: https://www.ti.com/lit/ug/snlu243/snlu243.pdf?ts=1696975993938

    Note that the FPD-Link line rate depends on the REFCLK you are using and the mode you are in. See Table 7-7 Clocking Modes in the 953 datasheet. 

    Regards,

    Cindy