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DS90UB954-Q1: Encoding: Does FPD-Link III also use 8b/10b encoding?

Teresa Fehr
Prodigy 20 points
Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: DS90UB935-Q1, DS90UB953-Q1, DS90UB936-Q1, DS90UB933-Q1

Hello dear TI-Team,

I saw some documentation before, that FPD-Link uses 8b/10b encoding, but I can't find anything about that in the Datasheet for FPD-Link III. Do you have any information on that?
If it is not 8b/10b, is it equivalent to that? What kind overhead does it have?
I saw a comparison in the overvview for FPD-Link II (Application Report SNLA102B–May 2008–Revised April 2013), is there something similar for FPD-Link III?

Thank you very much,

Teresa Fehr

  • 0
    TI__Guru** 103215 points

    Hello Teresa,

    There are different protocols used across different FPD III products actually. 

    DS90UB953-Q1/DS90UB96x-Q1/DS90UB95x-Q1/DS90UB935-Q1/DS90UB936-Q1 use 40 bit frames with 32 bits for video in each frame (so equivalent overhead to 8b/10b)

    DS90UB94x-Q1/DS90UB92x-Q1 use 35 bit frames with 24 bits of video in each frame (so overhead of 24/35)

    DS90UB91x-Q1/DS90UB933-Q1/DS9UB934-Q1 use 28 bit frames but depending on the mode, the overhead is different (see datasheet section for line rate calculations)

    The above is talking about video overhead only. These parts also support passing of other status, GPIO, I2C, etc. info through the channel at the same time. So total useable overhead is even lower than the above if you include that data. 

    Best Regards,

    Casey