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DP83867E: About TI DP83867 Application Question

Kuo Duke
Expert 2040 points
Part Number: DP83867E

Hi Team,

I have question about DP83867 need you help ,thanks.

1. I don’t use SGMII mode.
Can I use Rhi=4kohm and Rlow=10kohm option on RX_D0~RX_D3?
Then,
I want to set”0x03:address  for RGMII mode.
RX_D0=pull hi, RX_D1=pull hi, RX_D2=pull low, RX_D3=pull low. OK?

2. For the information, it seems LED0 is main indicates. Right?
     If so, I will modify that.  LED1 and LED2 are floating .OK?

3.  I don’t know where we can use GPIO. Those pins are floating. OK?

4.  How about JTAG? Do we need that?

  • 0
    TI__Mastermind 18425 points
    Hello,

    If SGMII mode is not used then please use the values in Table 5 for selecting the appropriate resistor value. Rhi=4kohm and Rlow=10kohm is used only in SGMII mode. Since you are not using SGMII mode then connecting strap to RX_D1 and RX_D3 is not required. For PHY Address 0x03, strap RX_D0 in mode 4 and RX_D2 in mode 2.

    Be default, LED 0 will indicate Link, LED1 will indicate Gigabit Link, and LED2 will indicate activity on cable. These functions can be edited through register 0x18. If LED1 or LED2 are not used then it is ok to leave them floating. All LED pins are also strap pins. If you wish to use any of the non-default strap functions then you will have to connect external pull resistors.

    Its ok to leave GPIO pins floating. They also have strap functions associated with them just like LED pins. If you wish to use any non-default settings, then you will need to connect strap resistors on the GPIO pins.

    JTAG pins are used for debug purposes and are not required for normal operation. When unused, they can be left floating. However it is recommended to pull JTAG TDI, TMS, and TDO high using a pull-up resistor (4.7kohm).

    -Regards,
    Aniruddha