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AM335x CPSW 3-port switch

Devaprasad GR
Intellectual 310 points


The AM335x device has 3-port switch (3PSW) Ethernet subsystem, i.e 2 ethernet ports.

what does this line mean. As for as my knowledge..3 port switch is the one where in we can connect 3 RJ45 connector..How will then it become 2 ethernet ports

  • 0
    TI__Guru**** 161600 points
    Hi,

    The line you quote:
    The AM335x device has 3-port switch (3PSW) Ethernet subsystem, i.e 2 ethernet ports.


    is correct. 3PSW is a reference to the ethernet subsystem. See Chapter 14 Ethernet subsystem in the device TRM (www.ti.com/.../spruh73o.pdf):

    "14.1 Introduction
    Described in the following sections is the Layer 2 3-port switch (3PSW) Ethernet subsystem. The 3-port switch gigabit ethernet subsystem provides ethernet packet communication and can be configured as an ethernet switch. It provides the gigabit media independent interface (GMII),reduced gigabit media independent interface (RGMII), reduced media independent interface (RMII), the management data input output (MDIO) for physical layer device (PHY) management.
    .......
    14.1.1 Features
    The general features of the ethernet switch subsystem are:
    • Two 10/100/1000 Ethernet ports with GMII, RMII and RGMII interfaces
    • Wire rate switching (802.1d)
    • Non Blocking switch fabric
    ......."

    Best Regards,
    Yordan