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Chapter 3 Hardware Installation
24
Chapter 3
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
HM961-QM87/HM86
Carrier Board
Description
SPI_CS#
B97
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ȟ
to Carrier Board
SPI Device CS# pin
Chip select for Carrier Board SPI - may be sourced from chipset SPI0 or SPI1
SPI_MISO
A92
I CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ȟ
to Carrier Board Data in to Module from Carrier SPI
SPI_MOSI
A95
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ȟ
to Carrier Board Data out from Module to Carrier SPI
SPI_CLK
A94
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ȟ
to Carrier Board Clock from Module to Carrier SPI
SPI_POWER
A91
O
3.3V Suspend/3.3V
Power supply for Carrier Board SPI – sourced from Module – nominally
3.3V. The Module shall provide a minimum of 100mA on SPI_POWER.
Carriers shall use less than 100mA of SPI_POWER. SPI_POWER
shall only be used to power SPI devices on the Carrier
BIOS_DIS0#
A34
BIOS_DIS1#
B88
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
HM961-QM87/HM86
Carrier Board
Description
VGA_RED
B89
O Analog
Analog
PD 150 TO GND
PD 150R,connect to VGA connector with EMI
Red for monitor. Analog output
VGA_GRN
B91
O Analog
Analog
PD 150 TO GND
PD 150R,connect to VGA connector with EMI
Green for monitor. Analog output
VGA_BLU
B92
O Analog
Analog
PD 150 TO GND
PD 150R,connect to VGA connector with EMI
Blue for monitor. Analog output
VGA_HSYNC
B93
O CMOS
3.3V / 3.3V
Connect to VGA connector with a3.3V Buffer
Horizontal sync output to VGA monitor
VGA_VSYNC
B94
O CMOS
3.3V / 3.3V
Connect to VGA connector with a 33V Buffer
Vertical sync output to VGA monitor
VGA_I2C_CK
B95
I/O OD CMOS 3.3V / 3.3V
PU 2.2K TO 3V3
Connect to VGA connector with a 3.3V to 5V
DDC clock line (I2C port dedicated to identify VGA monitor capabilities)
VGA_I2C_DAT
B96
I/O OD CMOS 3.3V / 3.3V
PU 2.2K TO 3V3
Connect to VGA connector with a 3.3V to 5V
DDC data line.
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
HM961-QM87/HM86
Carrier Board
Description
SER0_TX
A98
O CMOS
3.3V/5V
PD 4.7K TO GND
General purpose serial port 0 transmitter
SER0_RX
A99
I CMOS
3.3V/5V
PU 47K TO 3V3
General purpose serial port 0 receiver
SER1_TX
A101
O CMOS
3.3V/5V
PD 4.7K TO GND
General purpose serial port 1 transmitter
SER1_RX
A102
I CMOS
3.3V/5V
PU 47K TO 3V3
General purpose serial port 1 receiver
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
HM961-QM87/HM86
Carrier Board
Description
I2C_CK
B33
I/O OD CMOS 3.3V Suspend/3.3V
PU 2.2K TO 3V3_DU_EC
General purpose I2C port clock output
I2C_DAT
B34
I/O OD CMOS 3.3V Suspend/3.3V
PU 2.2K TO 3V3_DU_EC
General purpose I2C port data I/O line
SPKR
B32
O CMOS
3.3V / 3.3V
Output for audio enunciator - the "speaker" in PC-AT systems.
This port provides the PC beep signal and is mostly intended for
debugging purposes.
WDT
B27
O CMOS
3.3V / 3.3V
Output indicating that a watchdog time-out event has occurred.
FAN_PWNOUT
B101
O OD CMOS
3.3V / 12V
Fan speed control. Uses the Pulse Width Modulation (PWM) technique to control the fan's RPM.
FAN_TACHIN
B102
I OD CMOS
3.3V / 12V
PU 10K TO 3V3
Fan tachometer input for a fan with a two pulse output.
TPM_PP
A96
I CMOS
3.3V / 3.3V
PU 10K TO GND
Trusted Platform Module (TPM) Physical Presence pin. Active high.
TPM chip has an internal pull down. This signal is used to indicate
Physical Presence to the TPM.
Serial Interface Signals Descriptions
Miscellaneous Signal Descriptions
SPI Signals Descriptions
I CMOS
NA
Selection straps to determine the BIOS boot device.
The Carrier should only float these or pull them low, please refer to
COM Express Module Base Specification Revision 2.1 for strapping options of BIOS disable signals.
VGA Signals Descriptions
