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Does TLK105L support Speed LED?

g.f.
Guru 15520 points
Other Parts Discussed in Thread: TLK105L

Hi,

I have a question about TLK105L.

Does TLK105L support control of Speed LED?

In TLK105L datasheet page.49 Table 7-9, there are "Speed LED ON/OFF" bit field in LED Control Register bit2.

But in page.72 "Table 7-34 LED Control Register(LEDCR)", bit2 is Reserved area.

So, I guess that TLK105L are not supporting Speed LED control.

I want to make me sure, so please give me an answer.

best regards,

g.f.

  • 0
    TI__Mastermind 23675 points
    Hi g.f.,

    You can control the Speed LED function through the MLED register.

    Register 0x0025 (MLEDCR) outlines available functions for Speed LED functionality.

    If you want the LED to be ON when at 100BASE write 0x0029 to that register and the LED (pin 17) will be set for that.
    If you want the LED to be ON when at 10BASE write 0x0031 to that register and the LED (pin 17) will be set for that.

    You can also set the COL pin as a second LED (pin 29) when operating in RMII mode.

    Regards,
    Ross
  • 0 in reply to Ross Pimentel
    Guru 15520 points
    Hi Ross,

    Thank you for the reply.

    I understood that controlling Speed LED is available.

    I want to use COL pin to control Speed LED.
    If operating in MII Full-duplex mode, can I still use COL pin for Speed LED control?

    From TLK105L datasheet page.67 "Table 7-27 PHYSCR",
    if setting bit4 "COL FD Enable" to 0(Disable Collision indication in Full Duplex mode),
    I guess I can use COL pin as Speed LED control if I don't need Collision signal in Full-duplex.

    best regards,
    g.f.
  • 0 in reply to g.f.
    TI__Mastermind 23675 points
    Hi g.f.,

    Yes, If you know you are operating in FD mode then you can use the COL pin as your SPEED LED by setting the register.

    Regards,
    Ross
  • 0 in reply to Ross Pimentel
    Guru 15520 points
    Hi Ross,

    Thank you for the quick reply.
    I understood.

    best regards,
    g.f.
  • 0 in reply to Ross Pimentel
    Guru 15520 points
    Hi Ross,

    I'm sorry, I have one more thing to ask.
    What value of MLEDCR bit10(MLED pin29 Route&Enable), bit0(MLED pin Routing enable) will
    route the MLED to COL pin?
    In TLK105L datasheet page.75 Table 7-40, there are no value written for these bits.

    I guess setting '1' will Route&enable MLED but I want to make me sure.

    best regards,
    g.f.
  • 0 in reply to g.f.
    TI__Mastermind 23675 points

    Hi g.f.,

    To have MLED output on COL pin you will need to have bit [0]=1, b [1]=0, b [10]=1.

    Regards,

    Ross