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DP83826E: DP83826W recovered clock

Mathias Unterstein
Prodigy 90 points
Part Number: DP83826E

Hi,

do I understand the datasheet correctly when assuming the following:

Recovered clock can be outputted via LED0 (Pin30) or LED1 (Pin31).

According to datasheet (table 9-76 and 9-77, DS from 02/22) for both I have to set cfg_led0_gpio_ctrl[2:0] = 001b.

When using LED1 as output for recovered clock LED0 can NOT be used for LED anymore? (because cfg_led0_gpio_ctrl[2:0] = 001b ??)

So basically the questions are:

Where (which Pin) and how can I output the recovered clock?

Can I output recovered clock on LED1 AND use LED0 as LED0 (e. g. as LINK OK)?

Why are registers cfg_led0_gpio_ctrl and cfg_led1_gpio_ctrl of type R(ead) ?? I am not a SW guy but I would assume they are at least W(rite)

Thanks

Mathias

  • +1
    TI__Expert 3727 points

    Hi Mathias,

    You should be able to view recovered clk and use LED0 as LED0 at the same time. 

    Those registers are read only because they are status bits, the select bits is how you make your selection. I believe you are supposed to use register IO_CFG1 register to set you want the clock, and then for other LED wants, you are supposed to use the multi LED control register. 

    But to you query, yes you can do both at the same time. 

    Best,

    Alon