11
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
KBD_RST# Input to Module from (optional) exter-
nal keyboard controller that can force
a reset.
KBD_A20GATE Input to Module from (optional) ex-
ternal keyboard controller that can be
used to control the CPU A20 gate line.
BIOS_DIS0#
BIOS_DIS1#
Selection straps to determine the BIOS
boot device
BIOS_
DIS1#
BIOS_
DIS0#
Chip-
set SPI
CS1#
Destina-
tion
Chip-
set SPI
CS0#
Destina-
tion
1 1 Module Module
1 0 Module Module
0 1 Module Carrier
0 0 Carrier Module
Carrier
SPI_CS#
SPI
Descrip-
tor
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[0:3]
+/-
PCI Express Dierential Transmit Pair 0-3
PCIE_RX[0:3]
+/-
PCI Express Dierential Receive Pair 0-3
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.
See Electrical Specications for allowable
input range. If VCC5_SBY is used, all avail-
able VCC_5V_SBY pins on the connectors
must be used. Only used for standby and
suspend functions. May be left uncon-
nected if these functions are not used in
the system design.
VCC_RTC Real-time clock circuit-power input. Nomi-
nally +3.0V.
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 rising 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[0:1]_TX +/- Serial ATA Channel 0-1 transmit dif-
ferential pair.
SATA[0:1]_RX +/- Serial ATA Channel 0-1 receive dif-
ferential pair.
ATA_ACT# ATA (parallel and serial) activity indica-
tor, active low.
(19 Seiten)
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