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OCPRF100 MP Server System Technical Product Specification
Revision 1.0
122
10.2.3.5 System Event Log (SEL)
The system event log (SEL) serial EEPROM (which resides on the OCPROF100 I/O carrier on
the BMC’s private I
2
C bus) can be accessed by the front panel’s private bus under certain condi-
tions. This feature has been added to allow access when main power is down.
When the I2C_CEL_CONNECT_FPC signal is asserted, the serial EEPROM is connected elec-
trically to the FPC’s private I
2
C bus and is powered off of the 5 V standby supply.
When the I2C_CEL_CONNECT_BMC signal is asserted, the serial EEPROM is connected elec-
trically to the I/O’s private I
2
C bus and is powered off of the +3.3 V supply.
When both the I2C_CEL_CONNECT_FPC and the I2C_CEL_CONNECT_BMC signals are
asserted, the 5 V standby, +5 V, and the +3.3 V supplies are connected together. Firmware provi-
sions prevent this scenario from happening.
An additional consideration is the BMC on power-up. A firmware mechanism is required to tell
the BMC when this device is available.
It is required that the BMC’s I
2
C bus be static between 0 and 20 ms after the rising edge of the
I2C_CEL_CONNECT_BMC signal.
Upon power-up, the I2C_CEL_CONNECT_BMC signal is asserted and the
I2C_CEL_CONNECT_FPC is deasserted.
10.2.4 Front Panel Indicator LEDs
The POWER_FAIL LED is under the control of the FPC. When the FPC asserts (high) the
POWER_FAIL_LED_CMD signal, the LED becomes illuminated. This LED is off when deas-
serted and during an FPC reset. This LED is powered off of 5 V standby so it can be illuminated
even when +5 V is invalid.
The DRIVE_FAIL_LED is an indication of hard drive failure. It is illuminated when the
DRIVE_FAIL_LED_CMD signal is asserted (high). It is off when this signal is deasserted (low)
and during an FPC reset.
The POWER_GOOD_LED is an indication of good DC power in the system. It is illuminated
when the POWER_GOOD_LED_CMD signal is asserted (high). It is off when this signal is deas-
serted (low) and during an FPC reset.
The FAN_FAIL_LED is under the control of the BMC. The FPC queries the BMC for system fan
fail status. It illuminates when the FAN_FAILED_L signal is asserted (low) from the BMC. It is an
indication of system cooling failure. Additionally, there is an LED associated with each fan. These
LEDs are located adjacent to each individual fan to provide an indication of which of the six sys-
tem fans has failed. These LEDs are driven by the FPC.