104 www.xilinx.com Embedded Tri-Mode Ethernet MAC User GuideUG074 (v2.2) February 22, 2010Chapter 4: Physical Interface RMII SignalsAn Ethernet MAC wrapper has all necessary pin connections to configure the primitiveinto the media independent interface. Table 4-1 describes the MII interface signals.Figure 4-5: TX Acknowledge RegisterClock EnableACK seen hereEthernet MAC expects it to be held until hereEMAC#CLIENTTXACKRegisteredEMAC#CLIENTTXACKData (with registered ACK)D1D1D2D2D3EMAC#CLIENTTXGMIIMIICLKOUTPHYEMAC#RXCLKEMAC#PHYTXDPHYEMAC#RXDCLIENTEMAC#TXCLIENTCLKINCLIENTEMAC#RXCLIENTCLKINUG074_3_70_010906Table 4-1: MII Interface SignalsSignal Direction DescriptionMII_TXD[3:0]_# Output Transmits data to PHYMII_TX_EN_# Output Transmits data enable to PHYMII_TX_ER_# Output Transmits error signal to PHYMII_TX_CLK_# Input Recovered transmit clock by PHYMII_CRS_# Input Carrier sense control signal from PHYMII_COL_# Input Collision detect control signal from PHYMII_RX_CLK_# Input Recovered clock from data stream by PHYMII_RXD[3:0]_# Input Receive data from PHYMII_RX_DV_# Input Receive data valid control signal from PHYMII_RX_ER_# Input Receive data error signal from PHYwww.BDTIC.com/XILINX
