Technologic Systems TS-7200, User Manual, Page: 27 / 52

8 The 10/100 Base-T Ethernet Port
The EP9302 Ethernet LAN controller incorporates all the logic needed to interface
directly to any MII compatible Ethernet PHY chip. A low-power Micrel KS8721 chip is
used to implement the Ethernet PHY function and an integrated RJ-45 connector with
built-in 10/100 transformer and LED indicators completes the Ethernet sub-system.
The TS-7200 has both a LINK/ACTIVITY LED and a 10/100 speed LED built into each
RJ-45 connector that indicates the current Ethernet status. The LINK LED (left side of
connector, green) is active when a valid Ethernet link is detected. This LED should be
ON whenever the TS-7200 is powered on and properly connected to a 10/100BaseT
Ethernet network. The LINK/ACTIVITY LED will blink to indicate network activity for
either inbound or outbound data. The SPEED LED (right side of connector, amber) will
be on when a 100Mb network is detected and off for a 10Mb network. Both of these
LEDs are controlled by the KS8721 and do not require any overhead by the processor.
The Ethernet PHY chip can be powered down to save about 90 mA of power
consumption. This is controlled by the EP9302 Digital output on Port H bit 2. A logic
zero will power down the KS8721 PHY chip.
TS-7200 User's Manual Technologic Systems http://www.embeddedARM.com/
23 12/2004