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Original question:

DS90UB948-Q1: Propagation delay

DS90UB941AS-Q1: propagation delay

Ryan Wang
Expert 7425 points
Part Number: DS90UB941AS-Q1

Dear expert,

This is follow up question for below link:

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/906516/ds90ub948-q1-propagation-delay?tisearch=e2e-sitesearch&keymatch=ds90u%25252525252525252A%252525252525252520AND%252525252525252520delay

The answer only mentioned propagation delay inside UB948. Then how about inside UB941 and from UB941 to UB948? Thanks 

  • 0
    TI__Guru** 107810 points

    Hello Ryan,

    The 941AS Delay is Typically 145xT (As per datasheet)

    The 948 Delay is Typically 147xT (As per datasheet)

    The FC delay can be calculated as following: FC_Delay = Period of the FC Frame Rate

    a) Data is sent across the FC in frames. A single FC frame consists of 35 bits containing RGB, GPIO, I2C, sync signals, etc...

    c) You need to wait for at least one frame to be sent over the FC. This is the FC delay.

    f) To calculate the FC frame rate, you divide your configured FC frequency by 35 bits. (Frame Rate = FC freq [bits/sec] / 35 [bits/frame])

    g) Then, you calculate the Period to get the FC_Delay (Period = 1 / (Frame Rate)). Multiply by 2 to calculate for the worst case.