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DP83822IF: OK

Daejin Ryu
Prodigy 30 points
Part Number: DP83822IF

Tool/software:

Dear Manager,

I'm using the PHY, DP83822IFRHBR.

I have the following questions while using it.

Please let me know how can I solve it.

- Desired setting

  * 1. MLED rout to LED_0 : set bit[1:0] to 11 @0x0025

  * 2. MLED configuration to TX activity : set bit[6:3] to 001 0 @ 0x0025

  * 3. LED_0 blink rate to 20ms : set bit[10:9] to 00 @ 0x0018

- Good operation

  * above 1, 2 setting

- Bad operation

  * above 3.

  * Even if I change the blink rate via bit[10:9] @ 0x0018 register, LED_0 always behaves the same.

    - ex: when TX at every 500ms, LED_0 remains low for 350ms and then goes high for 150ms.

  * The initial value of 0x0018 is 0x4000, and it was confirmed that it becomes 0x0000 after bing set to 20ms (0x0000)

- Question

  1. How can I change the LED_0 blink rate?

Regards,

DaeJin

  • 0
    TI__Mastermind 30640 points

    Hi DaeJin,

    Try avoiding steps 1 and 2 so that MLED is not routed to LED_0. To enable blinking based on link activity, set the LED Configuration register to '0'

    When doing this, are you able to see the LED_0 blink rate change?

    Alternatively, keep step 1 and 3, but try setting MLEDCR [6:3] to 1000 for blink on TX/RX activity rather than to just TX activity.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Prodigy 30 points

    Dear Shane

    Thank you for your reply.

    My reply was rate due to the holiday.

    When I set the LED configuration register to 0, the LED_0 blink rate changed.

    (However, I had to set the LED_0 polarity to '1', so that LED_0 changed as follows : H -> L (setting time / 2) -> H)

    ex: set 50ms ==>  H(975ms)-> L(25ms) -> H...repeat

    However, when I set LED_0 as MLED output, the blink rate did not changed.

    (However, the LED_0 polarity changed)

    ex: TX at every 500ms && LED_0 polarity to '1'  ==> H(350ms) -> L(150ms, never changed) -> H....repeat

    How can I set that LED_0 turns on for 50ms when only TX activity?

    Regards,

    DaeJin

  • 0 in reply to Daejin Ryu
    TI__Mastermind 30640 points

    Hi Daejin,

    The 'TX activity' MLED setting does not support a blink mode. Try setting MLEDCR [6:3] to 1000 for blink on TX/RX activity rather than to just TX activity if you want the LED blink.

    I'm not aware of a method to set the LED blink rate for the 'TX activity' setting.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Prodigy 30 points

    HI Shane

    Thanks for the answer.

    According to your answer, it seems like the behavior I want is not supported.

    So, when setting the LED to TX activity, is it not possible to adjust the time it is on when TX?

    I am asking again because that setting is important.

    Regards,

    DaeJin

  • 0 in reply to Daejin Ryu
    TI__Mastermind 30640 points

    Yes your understanding is correct. There is no way to adjust the 'on' time for this LED as it is tied directly to the activity of the interface.

    Best,

    Shane