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Chapter 3 Hardware Installation
18
Chapter 3
US
B23
AC Coupling capacitor
USB_SSTX0-
B22
AC Coupling capacitor
US
A23
USB_SSRX0-
A22
US
B26
AC Coupling capacitor
USB_SSTX1-
B25
AC Coupling capacitor
US
A26
USB_SSRX1-
A25
USB_HOST_PRSNT
B96
I CMOS
3.3V Suspend/3.3V
NA
NA
Module USB client may detect the presence of a USB host. A high value (NA for AL9A2)
indicates that a host is present.
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
AL9A2
Carrier Board
Description
A71
LVDS_A0-
A72
A73
LVDS_A1-
A74
A75
LVDS_A2-
A76
A78
LVDS_A3-
A79
LV
A81
LVDS_A_CK-
A82
LVDS_VDD_EN
A77
O CMOS
3.3V / 3.3V
Connect to enable control of LVDS panel power
circuit
LVDS panel power enable
LVDS_BKLT_EN
B79
O CMOS
3.3V / 3.3V
Connect to enable control of LVDS panel backlight
power circuit.
LVDS panel backlight enable
LVDS_BKLT_CTRL
B83
O CMOS
3.3V / 3.3V
Connect to brightness control of LVDS panel
backlight power circuit.
LVDS panel backlight brightness control
LVDS_I2C_CK
A83
I/O OD CMOS 3.3V / 3.3V
PU 4.7K to 3.3V
Connect to DDC clock of LVDS panel
I2C clock output for LVDS display use
LVDS_I2C_DAT
A84
I/O OD CMOS 3.3V / 3.3V
PU 4.7K to 3.3V
Connect to DDC data of LVDS panel
I2C data line for LVDS display use
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
AL9A2
Carrier Board
Description
LPC_AD0
B4
LPC_AD1
B5
LPC_AD2
B6
LPC_AD3
B7
LPC_FRAME#
B3
O CMOS
3.3V / 3.3V
LPC frame indicates the start of an LPC cycle
LPC_DRQ0#
B8
LPC_DRQ1#
B9
LPC_SERIRQ
A50
I/O CMOS
3.3V / 3.3V
LPC serial interrupt
LPC_CLK
B10
O CMOS
3.3V / 3.3V
LPC clock output - 33MHz nominal
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
AL9A2
Carrier Board
Description
SPI_CS#
B97
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ƻ
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
ƻ
Connect a series resistor 33
ȟ
to Carrier
Board SPI Device SO pin
Data in to Module from Carrier SPI
SPI_MOSI
A95
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ƻ
Connect a series resistor 33
ȟ
to Carrier
Board SPI Device SI pin
Data out from Module to Carrier SPI
SPI_CLK
A94
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33
ƻ
Connect a series resistor 33
ȟ
to Carrier
Board SPI Device SCK pin
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
I CMOS
NA
PU 10K to 3.3V
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.
LPC Signals Descriptions
I/O CMOS
3.3V / 3.3V
3.3V / 3.3V
LPC serial DMA request
SPI Signals Descriptions
I CMOS
LPC multiplexed address, command and data bus
Connect to LPC device
LVDS Channel A differential clock
O LVDS
LVDS
LVDS Signals Descriptions
O LVDS
LVDS
LVDS Channel A differential pairs
O LVDS
LVDS
O LVDS
LVDS
Connect to LVDS connector
Connect to LVDS connector
Connect to LVDS connector
Connect to LVDS connector
Connect to LVDS connector
O PCIE
AC coupled on Module
Additional transmit signal differential pairs for the SuperSpeed USB data path.
I PCIE
AC coupled off Modul
Additional receive signal differential pairs for the SuperSpeed USB data path.
O LVDS
LVDS
I PCIE
AC coupled off Modul
Additional receive signal differential pairs for the SuperSpeed USB data path.
O PCIE
AC coupled on Module
Additional transmit signal differential pairs for the SuperSpeed USB data path.
Connect 90
ಳ
@100MHz Common Choke in series
and ESD suppressors to GND to USB connector
Connect 90
ಳ
@100MHz Common Choke in series
and ESD suppressors to GND to USB connector
Connect 90
ಳ
@100MHz Common Choke in series
and ESD suppressors to GND to USB connector
Connect 90
ಳ
@100MHz Common Choke in series
and ESD suppressors to GND to USB connector
