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DP83822I: Power up Timing

Brian Wang0928
Genius 14160 points
Part Number: DP83822I
Other Parts Discussed in Thread: AM3352

Team,

Two device questions here.

For the T3 of the power up timing, d/s says max value is 200ms. What's the typical value? Is there a counter inside the device for T3?

What if there is external signal to influence it duringT3 period of time? For example, if there is something unexpected behavior happened with AM3352 inside PD. how does DP83822 response if something is happened?

There are 4 modes in device with HW strap setting. 

what if the strap voltage is fall in 0.9142V ~ 2.2901V? How does device react if strap voltage is out of this range? 

  • 0
    TI__Mastermind 39895 points

    Hi Brian,

    It is recommended that the MAC keep the respective pins that are used for bootstrapping of our PHY in Hi-Z mode. If there is any voltage on line that is not due to resistor network used to DC bias the line during bootstrapping, then there is a chance that PHY will be incorrectly strapped. If voltage is outside of ranges defined, we do not have any data as to how the PHY will respond. It is important that customer follows bootstrap values in datasheet and that line is only driven by resistor network.

    Sincerely,

    Gerome