Xilinx UG194 Virtex-5 FPGA Embedded Tri-Mode Ethernet MAC ...

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Chapter 6: Physical Interface Media Independent Interface (MII) The Media Independent Interface (MII), defined in IEEE 802.3, clause 22, is a parallel interface that connects a 10-Mb/s and/or 100-Mb/s capable MAC to the physical sublayers. Figure 6-2 shows the Ethernet MAC configured for MII. The physical signals of the Ethernet MAC are connected through IOBs to the external interface. The “logic cloud” indicates that alternative implementations are possible. Ethernet MAC Figure 6-2: Ethernet MAC Configured in MII Mode There are two alternative implementations available that use different clocking schemes: the standard clocking scheme without clock enables or an alternative clock enable scheme that saves on global clock resources. “Ethernet MAC Clocks,” page 205 introduces these two clocking models, which are described in detail in the following sections: “MII Standard Clock Management” Virtex-5 Device IOBs and Clock Logic MII_RX_CLK MII_RXD[3:0] MII_RX_DV MII_RX_ER MII_TX_CLK MII_TXD[3:0] MII_TX_EN MII_TX_ER MII_COL MII_CRS “MII Clock Management using Clock Enables” If the CORE Generator tool is used, the wrapper files for the Ethernet MAC that are created will contain the logic described in these sections. By using the CORE Generator tool, the time required to instantiate the Ethernet MAC into a usable design is greatly reduced. See “Accessing the Ethernet MAC from the CORE Generator Tool,” page 25. 140 www.xilinx.com TEMAC User Guide UG194 (v1.10) February 14, 2011 MII Physical Interface UG194_6_02_072106 R
TX CLIENT LOGIC RX CLIENT LOGIC R MII Standard Clock Management Media Independent Interface (MII) Figure 6-3 shows the standard clock management scheme when the MII interface is selected. Both the MII_TX_CLK and MII_RX_CLK, generated from the PHY, have a frequency of either 2.5 MHz or 25 MHz, depending on the operating speed of the Ethernet MACs. EMAC#CLIENTTXCLIENTCLKOUT connects to EMAC#CLIENTTXCLIENTCLKIN through a BUFG. Its frequency is either 12.5 MHz or 1.25 MHz, depending on the operating speed of the Ethernet MAC. MII_TX_CLK_# connects to PHYEMAC#TXGMIIMIICLKIN and the MII_TXD registers through a BUFG. Its frequency is either 12.5 MHz or 1.25 MHz, depending on the operating speed of the Ethernet MAC. The RX client clocking is similar. BUFG BUFG EMAC# PHYEMAC#GTXCLK PHYEMAC#TXGMIIMIICLKIN EMAC#PHYTXGMIIMIICLKOUT CLIENTEMAC#TXCLIENTCLKIN EMAC#CLIENTTXCLIENTCLKOUT EMAC#PHYTXD[3:0] EMAC#PHYTXD[7:4] PHYEMAC#MIITXCLK CLIENTEMAC#RXCLIENTCLKIN EMAC#CLIENTRXCLIENTCLKOUT PHYEMAC#RXCLK PHYEMAC#RXD[3:0] CLIENTEMAC#DCMLOCKED PHYEMAC#RXD[7:4] Notes: 1) A regional buffer (BUFR) can replace this BUFG. In addition, the clock input of IFD can be driven by a BUFIO. Refer to UG190, Virtex-5 FPGA User Guide for BUFR usage guidelines. Figure 6-3: MII Clock Management The CLIENTEMAC#DCMLOCKED port must be tied High. UG194_6_03_081409 TEMAC User Guide www.xilinx.com 141 UG194 (v1.10) February 14, 2011 X X IFD Q D BUFG (1) OFD D Q BUFG (1) IBUFG OBUF IBUFG IBUF MII_TX_CLK MII_TXD[3:0] MII_RX_CLK MII_RXD[3:0]
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Virtex-5 FPGA Embedded Tri-Mode Eth
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Date Version Revision 08/08/07 (con
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Date Version Revision 10/01/09 1.9
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Table of Contents Guide Contents .
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R Chapter 5: MDIO Interface Introdu
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R About This Guide Guide Contents P
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R Additional Support Resources User
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R Typographical Online Document Use
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Introduction Key Features R Chapter
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R Typical Ethernet Application Over
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R Number of Bytes Physical Sublayer
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R Data Pad FCS Ethernet Protocol Ov
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R Using the Embedded Ethernet MAC T
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R Ethernet MAC Overview Chapter 2 T
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Generic Host Bus DCR Bus R Flow Con
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R Ethernet MAC Primitive Ethernet M
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R Ethernet MAC Signal Descriptions
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R Table 2-3: Receive Client Interfa
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R DCR Bus Signals Table 2-6: DCR Bu
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R Table 2-8: PHY Data and Control S
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R Table 2-12: PCS/PMA Signals Table
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R Table 2-16: Mode Configuration At
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R Table 2-17: MAC Configuration Att
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R Table 2-17: MAC Configuration Att
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R Table 2-18: Physical Interface At
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R Client Interface Chapter 3 This c
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R Normal Frame Transmission CLIENTE
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R CLIENTEMAC#TXCLIENTCLKIN CLIENTEM
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R CLIENTEMAC#TXCLIENTCLKIN CLIENTEM
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R Normal Frame Transmission PHYEMAC
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R CLIENTEMAC#TXCLIENTCLKIN PHYEMAC#
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R CLIENTEMAC#TXCLIENTCLKIN PHYEMAC#
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R Frame Reception with Errors CLIEN
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R Receive (RX) Client: 8-Bit Interf
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R Receive (RX) Client: 16-Bit Inter
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R Address Filtering Address Filteri
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R CLIENTEMAC#RXCLIENTCLKIN Flow Con
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R Transmitting a PAUSE Control Fram
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R Operation Figure 3-30 illustrates
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R Ethernet MAC Block EMAC#CLIENTTXS
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R Table 3-3: Bit Definitions for th
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R CLIENTEMAC#RXCLIENTCLKIN EMAC#CLI
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R Host/DCR Bus Interfaces This chap
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HOSTCLK HOSTMIIMSEL HOSTREQ HOSTOPC
Page 89 and 90: R Table 4-3: Receiver Configuration
Page 91 and 92: R Table 4-5: Flow Control Configura
Page 93 and 94: R Table 4-7: RGMII/SGMII Configurat
Page 95 and 96: R Table 4-9: Unicast Address (Word
Page 97 and 98: R Table 4-13: Address Filter Mode 0
Page 99 and 100: R HOSTCLK HOSTMIIMSEL HOSTOPCODE[1]
Page 101 and 102: R HOSTCLK HOSTMIIMSEL HOSTREQ HOSTO
Page 103 and 104: R Using the DCR Bus The directly ad
Page 105 and 106: R Table 4-18: DCR Control Register
Page 107 and 108: R Using the DCR Bus The IRENABLE_e#
Page 109 and 110: R // Write to the cntlReg_e1 regist
Page 111 and 112: DCR Offset 0x1 MSB R Using the DCR
Page 113 and 114: R Using the DCR Bus // EMAC Managem
Page 115 and 116: R MDIO Interface Chapter 5 This cha
Page 117 and 118: MDC MDIO R MDIO Transactions Introd
Page 119 and 120: R MDIO Implementation in the Ethern
Page 121 and 122: Generic Host Bus DCR Bus R PHYEMAC#
Page 123 and 124: R 1000BASE-X PCS/PMA Management Reg
Page 125 and 126: R Table 5-4: Status Register (Regis
Page 127 and 128: R 1000BASE-X PCS/PMA Management Reg
Page 129 and 130: R Table 5-13: Vendor-Specific Regis
Page 131 and 132: R 2, 3 “PHY Identifier (Registers
Page 133 and 134: 1.2 SGMII Link Status R Table 5-16:
Page 135 and 136: R Table 5-22: SGMII Auto-Negotiatio
Page 137 and 138: R Physical Interface Chapter 6 This
Page 139: R GMII / MII RGMII SGMII Introducti
Page 143 and 144: R Gigabit Media Independent Interfa
Page 145 and 146: GTX_CLK R IBUFG TX CLIENT LOGIC RX
Page 147 and 148: GTX_CLK R IBUFG BUFG TX Client Logi
Page 153 and 154: R Reduced Gigabit Media Independent
Page 157 and 158: GTX_CLK TX Client Logic RX Client L
Page 159 and 160: GTX_CLK TX Client Logic RX Client L
Page 165 and 166: FPGA R PCS/PMA Sublayer MAC TX Inte
Page 167 and 168: R Ethernet MAC to RocketIO Serial T
Page 169 and 170: TX and RX Client Logic R 1000BASE-X
Page 171 and 172: R 1000BASE-X PCS/PMA REFCLKOUT outp
Page 173 and 174: R DCM BUFG CLKFB CLK0 CLKIN CLKFX B
Page 175 and 176: R 1000BASE-X PCS/PMA IEEE Std 802.3
Page 177 and 178: R 1000BASE-X PCS/PMA Ethernet MAC.
Page 179 and 180: FPGA R Introduction to the SGMII Im
Page 181 and 182: R RX Elastic Buffer Implementations
Page 183 and 184: R Serial Gigabit Media Independent
Page 189 and 190: R Ethernet MAC (PCS/PMA Sublayer) E
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TX and RX Client Logic R SGMII Cloc
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R Serial Gigabit Media Independent
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DCM CLKFB CLK0 CLKIN CLKDV CLKDV_DI
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R Serial Gigabit Media Independent
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R Interfacing to a Statistics Block
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R Using the DCR Bus to Access Stati
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R Pinout Guidelines Appendix A Xili
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R Ethernet MAC Clocks Appendix B Th
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TX Client Logic RX Client Logic R
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R Clock Enables Clock Connections t
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R Receiver Clock Clock Definitions
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R GMII (Byte PHY) Mode Clock Defini
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R Clock Definitions and Frequencies
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R Virtex-4 to Virtex-5 FPGA Enhance
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R Clock Enables Modifications Relat
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R Additional Attributes Table C-2:
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R Appendix D Differences between So
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