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DP83848Q-Q1: Transmit and receive links

Cherry Zhou
Mastermind 22235 points
Part Number: DP83848Q-Q1

Hi Team,

Could you help tell how to operate BIST to verify the integrity of the transmit and receive links of DP83848Q? (Based on 100 m/s data stream) Thanks.

Best Regards,

Cherry

  • TI__Genius 9690 points

    Hi Cherry,

    Here are the steps to run BIST on the DP83848:

    1. Enable loopback mode by setting the LOOPBACK bit of BMCR register to 1
    2. (Optional) Set the bit PSR_15 in PHYCR to use 15 bit pseudo random sequence, instead of the default 9 bit sequence
    3. Start the BIST by setting the BIST_START bit of PHYCR register to 1
    4. Read the results by reading the BIST_STATUS bit of PHYCR, to check whether it is a 1(pass) or 0(fail)

    Also for 100M operation, the BMCR value would then be 0x6100. 

    Are you seeing any issues with your PHY or are you just verifying that it is functional?

    Best regards,

    Melissa