18
Pinouts and Signal Descriptions
3.3.10. SPI (BIOS only)
Signal
Pin #
Description
I/O
PU/PD
Comment
SPI_CS#
B97
Chip select for Carrier Board SPI BIOS Flash.
O 3.3VSB
PU 10K
3.3VSB
SPI_MISO A92 Data in to module from carrier board SPI BIOS
flash.
I 3.3VSB
SPI_MOSI A95 Data out from module to carrier board SPI
BIOS flash.
O 3.3VSB
SPI_CLK A94
Clock from module to carrier board SPI BIOS
flash.
O 3.3VSB
SPI_POWER A91 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
O P
3.3VSB
BIOS_DIS0# A34 Selection strap to determine the BIOS boot
device.
I
PU 10K
3.3VSB
Carrier shall pull to
GND or leave not-
connected.
BIOS_DIS1# B88 Selection strap to determine the BIOS boot
device.
I
PU 10K
3.3VSB
Carrier shall pull to
GND or leave not-
connected
3.3.11. Miscellaneous
Signal
Pin # Description
I/O
PU/PD
Comment
SPKR
B32
Output for audio enunciator, the “speaker” in
PC-AT systems
O 3.3V
WDT
B27
Output indicating that a watchdog time-out
event has occurred.
O 3.3V
THRM#
B35
Input from off-module temp sensor indicating
an over-temp situation.
I 3.3V
THERMTRIP# A35
Active low output indicating that the CPU has
entered thermal shutdown.
O 3.3V
Summary of Contents for Express-SL2
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Page 32: ...26 Pinouts and Signal Descriptions This page intentionally left blank ...
Page 42: ...36 Connector Pinouts on Module This page intentionally left blank ...
Page 46: ...40 Smart Embedded Management Agent SEMA This page intentionally left blank ...
Page 52: ...46 System Resources This page intentionally left blank ...
Page 78: ...72 BIOS Setup This page intentionally left blank ...
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