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ZEUS Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue D 52
Ethernet
The ZEUS SBC provides two 10/100-BaseTX interfaces with MAC and complies with
both the IEEE802.3u 10/100-BaseTX and the IEEE 802.3x full-duplex flow control
specifications.
Two single 10/100-BaseTX Ethernet controllers, Davicom DM9000A, are used to
implement Ethernet interfaces on ZEUS. DM9000A device provides an embedded PHY
and MAC and connects to 10/100-BaseTX magnetics. DM9000A also supports AUTO-
MDIX feature. Configuration data and MAC information are stored in an external serial
EEPROM (93LC46).
The DM9000A devices are connected to the PXA270 data bus (16-bit), and are
memory mapped. Connection to the ZEUS Ethernet ports is via dual RJ45 connector,
J6, with speed and link/activity status LEDs. For pin assignment and connector details,
see J6 – Ethernet connector
, page 80.
The link/activity LED (yellow) is illuminated when a 10/100-BaseTX link is made, and
when there is Tx/Rx activity. The speed LED (green) is illuminated when 100MB/s
speed is selected.