ZEUS Technical Manual

Detailed hardware description

 

 

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.

© 2007 Eurotech Ltd Issue D

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