CP321
Functional Description
ID 24977, Rev. 02
© 2003 Kontron Modular Computers GmbH
Page 2 - 17
2.4.4
System Status Indicators
Six system status indicators divided into two groups of three LED’s each are provided on the
front panel of the CP321. The first group (LED1) is application oriented whereas the second
group (LED2) is dedicated to and controlled by the Ethernet interface. The table below provides
an overview of the functionality associated with these indicators.
2.4.5
Coding Switch
The CP321 provides a 16-position, rotary coding switch (S2), which is available to the user for
general programming purposes. The setting and usage of this switch is a function of the appli-
cation (e.g. To configure software or change functionality of the board depending on the posi-
tion of the switch without reprogramming the configuration via interface access or software).
The actual position of the switch is read out of the coding switch register as a hexadecimal val-
ue. Refer to chapter 4, Coding Switch Register, for details of the register.
2.4.6
Digital Temperature Sensor (LM75)
For purposes of temperature surveillance and a means of determining the current board tem-
perature there is an digital temperature sensor (National Semiconductor LM75) installed on the
CP321. Used as a thermal watchdog, the LM75 can generate a maskable interrupt which can
be used by an application. In addition, the actual temperature can be read out of LM75 via the
I²C bus. This is can be used, for example, to maintain the calibration of the onboard RTC over
a wide operational temperature range. Refer to chapter 4, DTS Register, for further details.
Table 2-10:System Status Indicators
G
FP DES.
COLOR
NAME
DESCRIPTION
U
GREEN
LED1G
This LED blinks during startup indicating that the system is being ini-
tialized (bootstrap loading in progress). After system initialization has
been completed it is on steady and is available for use by the applica-
tion program. Refer to chapter 4 (Control Register) for setting of this
LED.
W
YELLOW
LED1Y
This LED is used to indicate the status of Watchdog Timer enabling.
When on, the Watchdog Timer is enabled.
H
RED
LED1R
This LED is available for general use and is application dependent. It
is off if not used. Refer to chapter 4 (Control Register) for setting of
this LED.
ACT
GREEN
LED2AC
This LED indicates that data are being transmitted or received via the
Ethernet link. It blinks when there is traffic on the link.
LNK
GREEN
LED2LN
This LED indicates the integrity of the Ethernet link. When on the link
is established in both directions.
SPEED
GREEN
LED2SP
This LED indicates the data rate of the Ethernet link.
When on the speed is 100 Mbps; off it is 10 Mbps.
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