DS90UB928Q-Q1: delay from video input to output

Hi Colt,

Video latency calculations are explained through this E2E regarding timings and typical DES delays:

(+) [FAQ] DS90UB983-Q1: Video output latency from SER input to DES output - Interface - INTERNAL forum - Interface - INTERNAL - TI E2E support forums

Please let me know if this answers your question, or if you need further clarification.

Best!

Miguel

Hi Qiang,

Since you are unable to see the internal forum, I will provide the brief explanation here:

The SER should buffer 1-2 video lines before starting transmission under typical conditions, DES can buffer up to 512 pixels.

Typical latency = 1 * line time + 512 pixel time

Here is an example calculation:

Active Video Timing = 3840 x 2160 @ 60 fps

Total Dimensions = 4000 x 2222

PCLK = 533.25 MHz

Pixel Time = 1/533.25 MHz = 1.87 ns per pixel

Line Time = 1.87 ns * 4000 px = 7.48 µs (total horizontal represents one line buffer)

Typical latency = 1 * 7.48 µs + (512 * 1.87 ns) = 8.437 µs

Please let me know if this explains what you are looking for, or if further clarification is needed.

Best,

Miguel

You're welcome!

Feel free to mark this thread as resolved if this is all you needed! :)