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21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller
Design Guide 7
SYM-based PHY devices are provided by GEC Plessey*, Quality Semiconductor*, and Micro
Linear*.
The SYM-based PHY design includes the following components:
• The SYM-based PHY devices, which have a direct interface to the SYM port of the 21143
with an interface to the 100 Mb/s magnetics module.
• The magnetics module, which is based on transformers and serial chokes enabling the network
connection to the 100 Mb/s-only network (100BASE-TX or 100BASE-T4).
2.0 21143 Ports
Table 2 lists the active AUI signals when the 21143 AUI port is selected.
Table 3 lists the active twisted-pair signals when the 21143 10BASE-T port is selected.
Table 4 lists the active MII signals when the 21143 MII port is selected.
Figure 2. SYM-Based PHY Design
SYM-Based
PHY
Devices
Magnetics
Module
100 Mb/s
Network
SYM Port
of
21143
Table 2. AUI Signals
Signal Pin Number
aui_cd– 138
aui_cd+ 137
aui_rd– 140
aui_rd+ 139
aui_td– 143
aui_td+ 142
Table 3. Twisted-Pair Signals
Signal Pin Number
tp_rd– 10
tp_rd+ 9
tp_td– 5
tp_td– – 4
tp_td+ 6
tp_td+ + 7