Chapter Four : M300V Interface Signal Specifications
35
Fan Tach MUX Bank Selector Signals
These signals select one of four fan tachometer banks to be switched in for read back by the
MegaRAC M300V card.
Signal Group: Multiplexed Fan Tachometer Controls
Signal Group
Signal Name
Signal Function
I/O
Signal
Termination on
MB*
Fan tachometer
MUX Controls
MCARD_FAN_SEL0_L Multiplexed
fan
tach MUX control 0
O
4.7k PU to +3.3V
MCARD_FAN_SEL1_L Multiplexed
fan
tach MUX control 1
O
4.7k PU to +3.3V
MCARD_FAN_SEL2_L Multiplexed
fan
tach MUX control 2
O
4.7k PU to +3.3V
MCARD_FAN_SEL3_L Multiplexed
fan
tach MUX control 3
O
4.7k PU to +3.3V
•
Fan tach multiplexer control (MCARD_FAN_SEL0_L–MCARD_FAN_SEL3_L)
•
Four tachometer MUX control active Low signals
•
Controls which tachometer bank is switched in from the motherboard-mounted digital
multiplexer. Firmware must not enable more than one of these signals simultaneously.
Single Wire Analog Voltage Sensor Signals
The analog voltage sensors are primary voltage rails brought in for the MegaRAC M300V card
A/D converters or analog comparators. The MegaRAC M300V card monitors these rails for
appropriate voltage levels. While some of the existing BMCs used on mCards provide A/D
converters, others provide analog comparators for voltage monitoring. The motherboard vendor
must properly condition the voltage rails connected to these inputs. All voltages that are linked to
these signals must be divided down or amplified up appropriately to meet the below
specifications:
ACOMP_ADC# Input Voltage Range = +1.8V – AVDD (max), positive
AVDD = +3.3V ± 2%
Signal Group: Single Wire Analog Sensors
Signal Group
Signal Name
Signal Function
I/O
Signal
Termination on
MB*
Single Wire
Analog Sensors
ACOMP_ADC0
Analog voltage input 0
I
N/A
ACOMP_ADC1
Analog voltage input 1
I
N/A
ACOMP_ADC2
Analog voltage input 2
I
N/A
ACOMP_ADC3
Analog voltage input 3
I
N/A
ACOMP_ADC4
Analog voltage input 4
I
N/A
ACOMP_ADC5
Analog voltage input 5
I
N/A
•
Analog voltage sensors (ACOMP_ADC0–ACOMP_ADC5)
•
Six analog voltage sensor inputs
Содержание MegaRAC M300V
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