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How to Read the 8-Bit POST Code
Due to the fact that only 4 LEDs are available and 8 bits must be displayed, the POST code output is
multiplexed on the User-Specific LEDs.
Table 8: POST Code Sequence
STATE
0
All ULEDs are OFF; star t of POST sequence
1
High nibble
2
Low nibble; state 2 is followed by state 0
The following is an example of the User-Specific LEDs' operation with POST configuration enabled (see
also Table 8).
Table 9: POST Code Example
ULED3
HIGH NIBBLE
of f (0)
LOW NIBBLE
of f (0)
POST CODE
0x41
Note:
Under normal operating conditions, the User-Specific LEDs should not remain lit during
boot-up. They are intended to be used only for debugging purposes. In the event that a
User-Specific LED lights up during boot-up and the AM4024(E) does not boot, please con-
tact Kontron.
If all User-Specific LEDs flash red on and off at regular intervals, they indicate that the
processor junction temperature has reached a level beyond which permanent silicon dam-
age may occur. Once activated, the overtemperature event remains latched until a cold re-
start of the AM4024(E) is undertaken (all power off and then on again).
2.7.2 Module Handle
At the front panel, the AM4024(E) provides a handle for module extraction as well as for securing the
module in the carrier / chassis and actuating the hot swap switch. The module handle supports a three-
position operation.
Figure 7: Module Handle Positions
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GENERAL PURPOSE LEDs
ULED2
ULED1
on (1)
of f (0)
of f (0)
of f (0)
Locked
Hot Swap
Unlocked
ULED0
RESULT
of f (0)
0x4
on (1)
0x1
User Guide
AM4024(E)
27
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