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RE: DP83620 transmission question - DP83848 receiver

JatanNaik
Expert 4011 points
Other Parts Discussed in Thread: DP83620

Thanks for the quick reply Patrick!

  • 0
    Prodigy 20 points

    Hi Jatan,

    I also have a similar situation

    I have a question on the DP83848.
    I have a DP83620 as a transmitter and a receiver as DP83848.
    the two chips stay of two different board connected to each other via two RJ-45 connectors.
    I want to use only two conductors for communication as shown in the attached figure.

    I have a DP83620 set as transmitter (Basic Mode Status) 01h BMSR Bit 7 set = 1 transmitter is always transmitting regardless Link Pulse

    the connection between the two is set in this way

    RJ45-RJ45 Tx-Rx
    Pin 1 TD + ------> pin 3 RD +
    Pin 2 TD - -------> pin 6 RD -


    1) Can i set Dp83848 as receiver only?

    The transmitter operates but not the receiver.

    2) I can set set the registers of the two DP so as to maintain proper communication?
    3) you can use two DP83848 ricevutore one as receiver and one as always with a link of two conductors?

  • 0
    Prodigy 20 points

    Hi Jatan,

    I also have a similar situation

    I have a question on the DP83848.

    I have a DP83620 as a transmitter and a receiver as DP83848.

    the two chips stay of two different board connected to each other via two RJ-45 connectors.

    I want to use only two conductors for communication as shown in the attached figure.

    I have a DP83620 set as transmitter (Basic Mode Status) 01h BMSR Bit 7 set = 1 transmitter is always transmitting regardless Link Pulse

    the connection between the two is set in this way

    RJ45-RJ45 Tx-Rx

    Pin 1 TD + ------> pin 3 RD +

    Pin 2 TD - -------> pin 6 RD -

    1) Can i set Dp83848 as receiver only?

    The transmitter operates but not the receiver.

    2) I can set set the registers of the two DP so as to maintain proper communication?

    3) you can use two DP83848 ricevutore one as receiver and one as always with a link of two conductors?

  • 0 in reply to Andrea Capriotti
    TI__Mastermind 31600 points
    Andrea,

    I have split your post off the previous thread so that we can focus on your specific implementation. For reference, the original post is still available at:
    e2e.ti.com/.../332504

    Patrick
  • 0 in reply to Patrick OFarrell
    TI__Mastermind 31600 points
    Andrea,

    When you are using a DP83620 as the transmitter and a DP83848 as a receiver, you indicate that the transmitter operates but not the receiver. How do you determine this? That is to say, how can you confirm that the transmitter operates as expected?

    You note that you are writing the BMSR of the DP83620. Are you also able to read the registers for both PHYs in order to determine their status?

    The DP83848 does not support unidirectional transmit. Writing to bit 5 of the BMSR will have no effect on the DP83848. Therefore, the same configuration you are using for the DP83620 will not work for the DP83848.

    Patrick