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DP83822IF: Hardware Bootstrap Configurations

Hirotaka Matsumoto
Guru 27585 points
Part Number: DP83822IF

Hi all

Would you mind if we ask DP83822?

Just in case, we would you like to confirm Hardware Bootstrap Configurations.
The datasheet shows as follows;
"The values of these pins are sampled at power-up and/or hardware reset, through either the RESET pin or bit[15] in the PHY Reset Control Register (PHYRCR, address 0x001F)."

Only at power-up and/or hardware reset, are the values of these sampled?
So, after power-up or hardware reset, is it possible to configure functional pins using MDIO/MDC?
We guess that it is used for hardware configuration without MDIO/MDC.
Is our recognition correct?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 23675 points
    Hi Hirotaka-san,

    You are correct in your understanding. Hardware bootstraps are used to help eliminate the need for MDIO/MDC access. If you do not want to use bootstraps, the PHY can be configured through MDIO/MDC after power-up/reset.

    The advantage of doing bootstraps in hardware though (besides no need for SW configuration) is that the PHY will be able to operate immediately after power-up/reset. If bootstraps are not used, the PHY might not operate the way you want it to until SW executes.

    Kind regards,
    Ross