DP83822H: MII master/slave operation for IEEE1588-PTP

Hi Sandeep,

MII interface does not have master/slave operation. If you want your system in MII mode, only need to strap RX_DV and RX_ER pin for DP83822 PHY. Strap resistor should place near the PHY.

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Regards,

Hillman Lin

Hi Hillman,

1. Our aim is to design an IEEE 1588 PTP based Communication with DP83822, is it possible with MII mode? 

2. Can you please specify the strapping options for MII mode . Is there any.document specifically for strapping options

3. We have RJ45 and optical fiber SFP port for the ethernet interfaces. Is there any strapping options specifically for RJ45/ optical communication.

Thanks and regards

Sandeep S

Hi Sandeep,

• Yes, IEEE 1588 PTP (Start Frame Detection) can be support in MII mode. 
• Leaving TX_ER and RX_DV open should be in MII mode
• COL pin can enable DP83822 Fiber application.

For more information on strapping, this following video would help:

https://www.ti.com/video/6116552664001?keyMatch=BOOTSTRAP%20VIDEO

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Regards,

Hillman Lin

Hi Hillman,

Thank you for you support. I need some clarifications regarding above reply.

• Leaving TX_ER and RX_DV open should be in MII mode
  • Is it RX_ER  (mentioned as TX_ER)?
• COL pin can enable DP83822 Fiber application.
  • For COL pin it is mentioned that  FX_EN: Enables 100BASE-FX when set to ‘1’. For enabling FX_EN we need to strap to mode 2 or 3.So COL pin is tied to 13K / 1.96K (IDEAL RH (kΩ) ) and 6.2K /1.96K (IDEAL RL (kΩ)) as in fig
    
  • leaving LED_0 Pin opened should 100BASE-FX, Full Duplex
• 

Is this how we should operate DP83822 for fiber application ?  

With regards

Sandeep S

Hi Sandeep,

• Sorry for the confusion. Yes you are correct, I mean RX_ER instead of TX_ER.
• Yes, you are correct on the fiber strapping statement.

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Regards,

Hillman Lin