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Each function is specified as follows:
Function
Speaker
Keyboard inhibit
Download
Reset
Hard disk activity
7.10 MISCELLANEOUS DEVICES
7.10.1 RESET Button on the Front Plate
Use a small tool to press the Reset button to restart the board. Reset function generates a
hardware reset and reboots the board.
7.10.2 Ethernet LEDs on the Front Plate
100BASE-T
Indicates 100Mbps operations when lit.
The LED is off when communicating at 10Mbps.
LINK
Indicates good link status for 10Mbps and 100Mbps operations.
ACTIVE
Indicates the presence of transmit or receive activity for 10Mbps or 100Mbps
operations.
The LED is driven through a monostable function which ensures that even the
minimum size packet generates adequate LED ON time to be visible.
Description
An 8 ohm speaker can be directly connected. The power stage is
incorporated onboard.
Keyboard inhibit function is used to switch the keyboard on or off.
Download function is used to transfer information to the Flash disk using
a serial link connected to COM1 serial port.
A normally open push button can be used to reset the board. Reset
interface is open drain, thus external logic is not required.
LED can be used to signal read and write operations on the hard disk.
7-15
Connecting Devices
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