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Original question:

DP83TC813S-Q1: shutdown-path implementation

DP83TC813S-Q1: Stand-by and Normal modes vs. RESET

Piotr F.
Intellectual 2360 points
Part Number: DP83TC813S-Q1

Hello Team,

My customer design 813 PHY application, and use RESET pin to put PHY in safe state (in case of any system error to cut down all communication on ETH interface).

There have questions:

After pulling the RESET how much time does the PHY stay in Stand-by mode before going into Normal mode again?
Or is the PHY in Standby mode during RESET state?

The RESET sets PHYRCR register bit 7 to 0b (Normal operation), but what happens after RESET is released?
Are we going into Standby or Normal mode?
The state diagram provided in the datasheet does not clarify this.

Piotr 

  • 0
    TI__Genius 17800 points

    Hi Piotr,

    You are correct, the RESET pin can be used to put the PHY in a safe state where there is no activity on the line. 

    We have not characterized the time the PHY spends in stand-by mode before going to normal mode after a reset. What is the importance of knowing this information?

    After reset is released, the PHY transition will depend on the bootstrapping of pin 28. In managed mode, the PHY will transition to the standby state and stay there until register 0x018B[6] is written to ‘0’. In autonomous mode, the PHY will go straight to normal mode. The current state machine state can be read in register 0x18E.

    Thanks,

    David