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.

  • Resolved

DLPLCR9000EVM: About trigger output in video mode.

Prodigy 60 points

Replies: 4

Views: 358

Part Number: DLPLCR9000EVM

Trigger output is working fine in pattern on the fly mode but we receive nothing when the device is connected in video mode.

We are using DMD in video mode as we need dynamic manipulation in our patterns. We want to see the exact time at which frame is changing and check whether there is some lag between the time pattern is shown on DMD and the computer input. In pattern mode we use trigger output for such purpose but in video mode it seems device does't give any trigger output. 

Is there some option or way to get trigger output in video mode?

Thank You.

  • Hello again Aditya,

    In Video Mode (not Video Pattern Mode) everything is driven by the incoming v-sync signal.  It is intended that this be the same as the "output trigger"  

    To be clear - the incoming frame data is received and the next frame sequence starts on the next v-synce.  In other words the RGB-888 data for the next frame is received while the current frame is displaying.

    If there is any delay, it should be deterministic and able to be characterized.

    Fizix

  • In reply to Fizix:

    hello again Fizix,

    I want to use trigger output,too.
    (to control other optical components like linear stages)

    is there anyway to get trigger output (Vsync) in video mode?
    Maybe I could get vsync by using HDMI to VGA converter or someting like that but I'm afraid it will make some delay..

    sry for my bad English again x(

    thank you.
  • In reply to user5378881:

    Hello Aditya,

    What you need to do is use Video Pattern Mode. You can here recreate the equivalent of video mode with the benefit of having Trigger out control.

    Your setup should be to add 3 8-bit blocks (R,G,B) but only one frame change in the green block.  Your setup should look like this:

    Note the single frame change in Green only (in the red outline).  Now you can use the Pattern Settings to control the output triggers:

    I hope this helps,

    Fizix

  • In reply to Fizix:

    Aditya,

    One other thing. The total exposure time of R+G+B must be less than (or equal to) the total incoming frame time (i.e. 16.7 ms) which is 5555 µs per each color. If not it will keep throwing a "Sequencer Abort Status Flag Error".

    There is a small amount of overhead, so you may have to reduce them slightly (let's say 5550 µs each).

    Fizix

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.