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21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller
Design Guide 15
3.3 AUI Network Port
The 21143 is fully compliant with the AUI standard. The AUI can interface with an external
medium-attachment unit (MAU) and connect to alternate media, such as 10BASE2 (ThinWire) and
10BASE5 (thickwire). Figure 8 and Figure 9 show the required connections.
Figure 8 shows the AUI 10BASE5 network connection and the pin connections between the 21143
and the isolation transformer. The required components for this configuration are as follows:
• Terminating and decoupling components
• Isolation transformer
• AUI connector
122 mii_txd<0> sym_txd<0>
123 mii_txen sym_txd<4>
124 mii_tclk sym_tclk
127 mii_rx_err sel10_100
128 mii_rclk mii_rclk
129 mii_dv N.C.
130 mii_rxd<0> sym_rxd<0>
131 mii_rxd<1> sym_rxd<1>
132 mii_rxd<2> sym_rxd<2>
133 mii_rxd<3> sym_rxd<3>
134 mii_mdc N.C.
135 mii_mdio N.C.
Table 7. MII/SYM Pinout (Sheet 2 of 2)
Pin Number MII Interface Function SYM Interface Function