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Ethernet

Hari Thazhe Oyyoth
Intellectual 380 points

Hi,

I am new to Ethernet. Can anyone please explain the concept of "Strapping" in Ethernet.

Regards

Hari

  • 0
    TI__Mastermind 31600 points
    Hari,

    Strapping is short for bootstrapping. The idea is to provide some level of device configuration without the need for register changes. For an Ethernet PHY, some examples of strap options would be the ability to configure the MAC interface (for example, MII vs. RMII or RGMII vs. SGMII) or the operational speed (for example, 1000Base-T vs.100Base-TX vs. 10Base-T).

    For the TI Ethernet portfolio, strapping is accomplished using resistors connected to the pins. A combination of pull up and/or pull down resistors on the board can set the desired functionality.

    Note that straps are not always necessary. In many cases, the register defaults are all that is needed for normal operation.

    Patrick
  • 0 in reply to Patrick OFarrell
    Intellectual 380 points
    Hi Patrick than you very much for your time and concern. One more question, How RGMII attains gigabit speed even though its is clocked at 125Mhz??
  • 0 in reply to Hari Thazhe Oyyoth
    TI__Mastermind 31600 points

    In Gigabit mode, the RGMII data is clocked on both edges of the 125MHz clock.

    Patrick