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TLK3134: Why Table 2-15 shows TXC(3:0) should be "0" when transmitting Normal data?

K.Yaita
Guru 29720 points
Part Number: TLK3134

Hi Team,

My customer considers to use GMII mode.
The Table 2-8 shows TXC(3:0) are assigned to TX_EN.



On the other hand, Table 2-15 shows TXC(3:0) should be "0" when trasmitting Normal data.



I couldn't understand why Table 2-15 shows TXC(3:0) (=TX_EN) should be "0" when transmitting Normal data..
I believe TX_EN should be "1" when transimitting Normal data because TX_EN is "Transmit Enable input".

Could you support it?

Best Regards,
Yaita

  • 0
    Guru 29720 points

    Hi Yaser-san,

    I couldn't understand what you refered..
    TX_EN is defined in IEEE Standard for Ethernet (IEEE Std 802.3-2012) and it refers TX_EN should be "1" to transmit normal data.

    On the other hand, TLK3134 datasheet Table 2-8 shows TX_EN should be connected to TXC(3:0).
    So I couldn't understand why Table 2-15 shows TXC(3:0) (=TX_EN) should be "0" when transmitting normal data..

    Best Regards,
    Yaita

  • 0
    TI__Genius 10250 points

    Hello,

    Sorry for the confusion.  I need to double check and get back to you.

    Regards,

    Yaser

  • 0 in reply to Yaser Ibrahim
    TI__Genius 10250 points

    Hello,

    I have double-checked and the information I had initially was incorrect. I apologize.

    Table 2-8 is the correct mapping for GMII, TXC(3:0) is mapped to TX_EN, and it should be 1 for transmitting normal data. K-codes are generated in this mode when TX_EN is 0, and will also depend on TX_ER (which is TXC(7:4)).

    Table 2-15 is applicable to XGMII/XAUI (and is not applicable to GMII or the other modes).  Here, TXC(3:0) are mapped to transmit control bits, and should be 0 for transmitting normal data and 1 for transmitting k-codes, as specified in the table.

    Regards,

    Yaser

  • 0 in reply to Yaser Ibrahim
    Guru 29720 points

    Hi Yaser-san,

    Thank you for your double-checked.
    I understand.

    Best Regards,
    Yaita