14
Motherboard Information
Chapter 3
Embedded and Industrial Computing
Miscellaneous Signals•
Signal Signal Description
I
2
C_CK General purpose I
2
C port clock output
I
2
C_DAT General purpose I
2
C port data I/O line
SPKR Output for audio enunciator - the
"speaker" in PC-AT systems
BIOS_DIS0#
BIOS_DIS1#
Selection straps to determine the BIOS
boot device
BIOS_
DIS1#
BIOS_
DIS0#
Chipset
SPI CS1#
Destina-
tion
Chipset
SPI CS0#
Destina-
tion
1 1 Module Module
1 0 Module Module
0 1 Module Carrier
0 0 Carrier Module
Carrier
SPI_CS#
SPI
Descriptor
BIOS
Entry
Ref
Line
High Module SPI0/
SPI1
0
High Module Carrier
FWH
1
SPI0 Carrier SPI0/
SPI1
2
SPI1 Module SPI0/
SPI1
3
KB_RST# Input to module from (optional) exter-
nal keyboard controller that can force
a reset.
KB_A20GATE Input to module from (optional) ex-
ternal keyboard controller that can be
used to control the CPU A20 gate line.
PCI Express Signals•
Signal Signal Description
PCIE_TX[0:4]
+/-
PCI Express Dierential Transmit Pair 0-4
PCIE_RX[0:4]
+/-
PCI Express Dierential Receive Pair 0-4
PCIE0_CK_
REF+/-
Reference clock output for PCI Express
lanes 0-7 and for PCI Express Graphics
lanes 0-15
Power Signals•
Signal Signal Description
VCC_5V_SBY Standby power input: +5.0V nominal. If
VCC5_SBY is used, all available VCC_5V_
SBY pins on the connectors must be
used. Only used for standby and suspend
functions. May be left unconnected if
these functions are not used in the system
design.
VCC_RTC Real-time clock circuit-power input. Nomi-
nally +3.0V.
VIN Primary power input: +9V~19V.
Power and System Management Signals•
Signal Signal Description
SUS_S3# Indicates system is in suspend to RAM
state. Active low output.
SUS_S4# Indicates system is in suspend to Disk
state. Active low output.
SUS_S5# Indicates system is in Soft O state.
BATLOW# Indicates that external battery is low
PWRBTN# Power button to bring system out of S5
(soft o), active on falling edge.
SMB_CK System Management Bus bidirectional
clock line.
SMB_DTA System Management Bus bidirectional
data line.
SMB_ALERT# System Management Bus Alert - input
can be used to generate an SMI# (System
Management Interrupt) or to wake the
system.
SUS_STAT# Indicates imminent suspend operation.
PWR_OK Power OK from main power supply
THRMTRIP# Active low output indicating that the CPU
has entered thermal shutdown.
THRM# Input from o-module temp sensor indi-
cating and over-temp situation.
SYS_RESET# Reset button input. Active low input.
WAKE0# PCI Express wake up signal.
WAKE1# General purpose wake up signal.
SATA Signals•
Signal Signal Discription
SATA[0:3]_TX
+/-
Serial ATA Channel 0-3 transmit dieren-
tial pair.
SATA[0:3]_RX
+/-
Serial ATA Channel 0-3 receive dierential
pair.
ATA_ACT# ATA (parallel and serial) activity indicator,
active low.
(15 Seiten)
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