DP83869HM: Functionality of TX_CTRL and RX_CTRL pins

Part Number: DP83869HM


 

Hi TI,

These are the pin functionality description of TX_CTRL and RX_CTRL mentioned in the datasheet....Kindly explain the functionality w.r.t both RGMII and GMII.

 

1)TX_CTRL pin denotes TX_EN on rising edge of GTX_CLK and denotes a logic derivative of TX_EN and TX_ER on the falling edge of GTX_CLK.

TX_ER = GMII_TX_ER (XOR) GMII_TX_EN

GMII_TX_ER and GMII_TX_EN are logical equivalent signals in GMII standard.

 

2)RX_CTRL denotes RX_DV on rising edge of RX_CLK and denotes a logic derivative of RX_DV and RX_ER on the falling edge of RX_CLK 

RX_ER = GMII_RX_ER (XOR) GMII_RX_DV

MII_RX_ER, and GMII_RX_DV are logical equivalent signals in GMII standard.

 

Thanks & Regards

Gireesh

  • Hi Gireesh, 

    TX_CTRL:  In RGMII mode, TX_CTRL combines the transmit enable and the transmit error signal inputs from the MAC using both clock edges.
    RX_CTRL: In RGMII mode, the receive data available and receive error are combined (RXDV_ER) using both rising and falling edges of the receive clock (RX_CLK).

    Best,
    J