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Chapter 2
HARDWARE INSTALLATION
User's Manual |
WL9A3
SPI Signals Descriptions
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
WL9A3
Carrier Board
Description
SPI_CS#
B97
O CMOS
3.3V Suspend/3.3V
Connect a series resistor 33Ω 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 49.9Ω
Connect a series resistor 33Ω 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 49.9Ω
Connect a series resistor 33Ω 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 49.9Ω
Connect a series resistor 33Ω to Carrier Board SPI
Device SCK pin
Clock from Module to Carrier SPI
SPI_POWER
A91
O
3.3V Suspend/3.3V
3.3V Susped Output
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#/
ESPI_SAFS
A34
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 Ex-
press Module Base Specification Revision 2.1 for strapping options
of BIOS disable signals.
BIOS_DIS1#
B88
Serial Interface Signals Descriptions
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
WL9A3
Carrier Board
Description
SER0_TX
A98
O CMOS
5V / 12V(design
3.3v~5V tolerant)
PD 4.7K
General purpose serial port 0 transmitter
SER0_RX
A99
I CMOS
5V / 12V(design
3.3v~5V tolerant)
General purpose serial port 0 receiver
SER1_TX
A101
O CMOS
5V / 12V(design
3.3v~5V tolerant)
PD 4.7K
General purpose serial port 1 transmitter
SER1_RX
A102
I CMOS
5V / 12V(design
3.3v~5V tolerant)
General purpose serial port 1 receiver
Miscellaneous Signal Descriptions
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
WL9A3
Carrier Board
Description
I2C_CK
B33
I/O OD
CMOS
3.3V Suspend/3.3V
PU 2.2K to 3V3SB
General purpose I2C port clock output
I2C_DAT
B34
I/O OD
CMOS
3.3V Suspend/3.3V
PU 2.2K to 3V3SB
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) tech-
nique to control the fan’s RPM.
FAN_TACHIN B102
I OD CMOS 3.3V / 12V
Fan tachometer input for a fan with a two pulse output.
TPM_PP
A96
I CMOS
3.3V / 3.3V
N/A
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.
(NC for WL9A3)