User’s Manual

2.4.2.1.9 Power & 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 Off state. Also known as "PS_ON" and can be used to

 

 

 

control an ATX power supply.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BATLOW#

 

Indicates that external battery is low

 

 

 

 

 

 

 

 

 

 

 

 

PWRBTN#

 

Power button to bring system out of S5 (soft off), active on rising edge.

 

 

 

SMB_CK

 

System Management Bus bidirectional

clock

line. Power

sourced

through

5V

 

 

standby rail and main power rails.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SMB_DTA

 

 

System Management Bus bidirectional

data

line. Power

sourced

through

5V

 

 

 

standby rail and main power rails.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

System Management Bus Alert - input can be used to generate an SMI# (System

 

SMB_ALERT#

 

Management Interrupt) or to wake the system. Power sourced through 5V standby

 

 

 

 

rail and main power rails.

 

 

 

 

 

 

 

 

 

 

 

 

SUS_STAT#

 

Indicates imminent suspend operation; used to notify LPC devices

 

 

 

PWR_OK

 

Power OK from main power supply

 

 

 

 

 

 

 

 

 

 

 

THRMTRIP#

 

Active low output indicating that the CPU has entered thermal shutdown.

 

 

THRM#

 

Input from off-module temp sensor indicating and over-temp situation.

 

 

 

 

 

 

 

 

SYS_RESET#

 

 

Reset button input. Active low input. System is held in hardware reset while this

 

 

 

input is low, and comes out of reset upon release.

 

 

 

 

 

 

 

 

 

 

 

RSMRST#

 

Resume reset input, active low. Resets power plane logic. May be left open on

 

 

carrier board if not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WAKE0#

 

PCI Express wake up signal

 

 

 

 

 

 

WAKE1#

 

General purpose wake up signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.4.2.1.10SATA Signals

Signal

Signal Description

SATA[0:3]_TX +/-

Serial ATA Channel 0-3 transmit differential pair.

SATA[0:3]_RX +/-

Serial ATA Channel 0-3receive differential pair.

 

 

ATA_ACT#

ATA (parallel and serial) activity indicator, active low.

 

 

ESM-2850 User’s Manual 31