I-Bus 0818D, User Manual

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Chapter 6 – Platform Management Option
0818D User’s Guide 6-8
When a new change in the alarm condition occurs, the enabled ACO
will be overridden. In other words, the audible alarm will be re-
enabled automatically until the ACO push button is pressed again.
6.5.8 CMC Health LED
The CMC board firmware changes the color of the CMC LED from
red to green when it finishes a self-test and begins operating
normally. Any conditions that prevent the CMC firmware from
running normally will cause this LED to turn red.
6.5.9 LED Self-Test Pushbutton
The CMC board provides an external Pushbutton for self-test of
display/status LEDs. Activating the LED Self-Test Pushbutton at any
time will cause the display/status LEDs to be turned on individually
for one second, one LED at a time. The sequence is: CRITICAL,
MAJOR, MINOR, ACO, and CMC LEDs.
6.5.10 Display/Status Board
The CMC board is able to control an external LED display/status
board to display the alarm status of the system. The display/status
signals are provided via the backplane. The following signals are on
the CompactPCI connector for the CMC:
CRITICAL LED (red)
MAJOR LED (orange)
MINOR LED (yellow)
ACO LED (yellow)
ACO PUSHBUTTON
SELF-TEST PUSHBUTTON
6.6 CMC Firmware Description
In general, the CMC is a stand-alone microcontroller that will perform
system management tasks on power up. This includes monitoring
the enclosure system environment independently of the SBC(s). The
parameters of the CMC operation, such as temperature thresholds,
etc. have been set to manufacturing defaults.
The communication port(s) between the CMC module and host
controller are needed for the purpose of setting up the module
parameters and acquiring the CMC status.
Reply message/packet from the CMC controller chip is sent to the
requestor only.