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dp83848i: LED RX and TX seperately

Croitoru David
Prodigy 10 points

Hello,

we are planning to use this ethernet PHY instead of an obsolete AMD PHY.

In order to have the same led behavior we need to seperate RX and TX for the leds signals.

Our idea is to use LED_ACT in combination with RX_DV or TX_EN to drive two leds:

Will this solution work ? I'm not sure if the timings will be correct to lit the leds long enough to be visible ?

Thanks for your help.

  • 0
    Intellectual 840 points

    Technically, it should.  There are a few things to look out for so as not to introduce data errors.  For a really old ( and i don't have the cable any more ) version of the same, I did a com port like that.  I included high speed diodes from the data lines ( germanium ) for fastest response and to ' vampire ' tap the lines. 

    This kept the interference down quite a bit.  I am not saying you will have to, just that I did and it dropped the interference ( data corruption from the detecting circuit holding the lines high longer than the data ) that may have been caused from the 74LS gates I was using.  Also If you can dual voltage your project, my preference is 5V ICs for doing it and electrically and other than shared ground, keeping it as a form of logic probe on board.

    Just my few cents worth on the circuit,

    Eric