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Chapter Four : M300V Interface Signal Specifications
31
Chapter 4
M300V Interface Signal
Specifications
Overview
This section provides detail on the signals specified for the OPMA connector. These signals are
collectively referred to as “the OPMA interface” in this document even though they are for the
MegaRAC M300V card.
Signal Callout Grouped by Functions
This section provides a description of the major buses and signal subgroups. Under each signal
group, individual signals are referred to by a short descriptive name followed by the capitalized
hardware signal name inside parentheses. For signals that are closely related, shortcuts have been
taken when displaying the associated hardware signal names. For example, if there are four signals
named SIG0, SIG1, SIG2 and SIG3, these are abbreviated as SIG0–SIG3.
LED Control Signals
The LED control signals enable the MegaRAC M300V card-controlled LEDs to provide a visual
indication of the hardware health and status. OPMA defines only two dedicated LED control
signals at the connector. If the system level manageability solution requires a more detailed visual
indication of faults with other LEDs or LCD indicators, they may be achieved through I
2
C or
SMBus-based indicators.
Any other system specific GPIOs should be implemented on the motherboard using I
2
C or
SMBus-based GPIO expanders (for example, 8575 devices). OPMA does not require the
implementation of additional GPIOs. However, such GPIOs are likely to be implemented for a
variety of purposes including GPIO based sensors and fault diagnostic LEDs. BMC firmware that
is specific to a given motherboard must handle these system specific GPIOs.
Signal Group: LED Control
Signal Group
Signal Name
Signal Function
I/O
Signal
Termination on
MB*
LED Control
FAULT_LED_L
Fault LED control
O
4.7k PU to +3.3V
CHASSIS_ID_L
Chassis identification LED control
O
4.7k PU to +3.3V
•
Fault LED control (FAULT_LED_L)
•
Connected to a BMC GPIO for fault status indicator LED control.
•
Direct BMC connection allows control of this LED even under a hung I
2
C or SMBus
scenario.
•
Chassis ID LED control (CHASSIS_ID_L)
•
Connected to a BMC GPIO for chassis ID LED control
•
Direct BMC connection simplifies blink rate control by the MegaRAC M300V card
firmware.
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