Intel 21143 manual AUI Network Port, MII/SYM Pinout Sheet 2 of, Design Guide

Intel® 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller

Table 7. MII/SYM Pinout (Sheet 2 of 2)

Pin Number	MII Interface Function	SYM Interface Function
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.

3.3AUI 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

Design Guide 15