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34 MegaRAC® M300V Card Implementer’s Reference and User’s Guide
Multi-Bank Fan Control Signals
OPMA partitions the server system fans into three control banks. Each bank can be independently
controlled to operate at three levels of speed through PWM control. Variable speed fans allow the
MegaRAC M300V card BMC to run the fans at the slowest (and therefore quietest) possible speed
while maintaining associated subsystems at acceptable temperature levels.
Signal Group: Multi-Bank Fan Control
Signal Group
Signal Name
Signal Function
I/O
Signal
Termination on
MB*
Multi-Bank
Fan Control
MCARD_FAN_PWM_CPU
mCard PWM CPU fan control
O
3.3V signal level
MCARD_FAN_PWM_SYS
mCard PWM system fan control
O
3.3V signal level
MCARD_FAN_PWM_PS
mCard PWM power supply fan control
O
3.3V signal level
•
System fan PWM control (MCARD_FAN_PWM_SYS)
•
PWM output to control the speed of all system fans
•
CPU fan PWM control (MCARD_FAN_PWM_CPU)
•
PWM output to control the speed of all CPU fans
•
Power supply fan PWM control (MCARD_FAN_PWM_PS)
•
PWM output to control the speed of all power supply fans
Multiplexed Fan Tach Input Signals
The fan tachometer inputs are provided for the MegaRAC M300V card to read in the RPM of each
set of fans connected to it. OPMA incorporates fan tach signal multiplexing. OPMA-compliant
motherboards must contain a 16:4 digital fan tach MUX. OEMs/ODMs can use this feature to
implement systems with up to 16 monitored fans. This multiplexer is controlled by the MegaRAC
M300V card. The MegaRAC M300V cards whose BMCs have less than four fan tach inputs must
add an additional 4:2 multiplexer (if the BMC has two fan tach inputs) or 4:1 multiplexer (if the
BMC has only one fan tach input) as required.
Signal Group: Multiplexed Fan Tachometers
Signal Group
Signal Name
Signal Function
I/O
Signal
Termination on
MB*
Multiplexed
Fan
Tachometers
MCARD_FAN_TACH0
Multiplexed fan tach input 0
I
4.7k PU to +3.3V
MCARD_FAN_TACH1
Multiplexed fan tach input 1
I
4.7k PU to +3.3V
MCARD_FAN_TACH2
Multiplexed fan tach input 2
I
4.7k PU to +3.3V
MCARD_FAN_TACH3
Multiplexed fan tach input 3
I
4.7k PU to +3.3V
•
Multiplexed fan tach inputs (MCARD_FAN_TACH0–MCARD_FAN_TACH3)
•
Four tachometer inputs from motherboard-based fan tachometer MUX.
Содержание MegaRAC M300V
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