DFI HM920-HM86 - Manual (Page 23)

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Signal Pin# Module Pin Type Pwr Rail /Tolerance HM920 Carrier Board Description
I2C_CK B33 I/O OD CMOS 3.3V Suspend/3.3V PU 2.2K to 3.3VSB General purpose I2C port clock output
I2C_DAT B34 I/O OD CMOS 3.3V Suspend/3.3V PU 2.2K to 3.3VSB 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.
Signal Pin# Module Pin Type Pwr Rail /Tolerance HM920 Carrier Board Description
PWRBTN# B12 I CMOS 3.3V Suspend/3.3V PU 10K TO 3.3VSB PU 4.7K TO 3.3VSB
A falling edge creates a power button event. Power button events can
be used to bring a system out of S5 soft off and other suspend states,
as well as powering the system down.
SYS_RESET# B49 I CMOS 3.3V Suspend/3.3V PU 10K TO 3.3VSB NC PU 4.7K TO 3.3VSB
Reset button input. Active low request for Module to reset and reboot.
May be falling edge sensitive. For situations when SYS_RESET# is
not able to reestablish control of the system, PWR_OK or a power
cycle may be used.
CB_RESET# B50 O CMOS 3.3V Suspend/3.3V
Reset output from Module to Carrier Board. Active low. Issued by
Module chipset and may result from a low SYS_RESET# input, a low
PWR_OK input, a VCC_12V power input that falls below the minimum
specification, a watchdog timeout, or may be initiated by the Module
software.
PWR_OK B24 I CMOS 3.3V / 3.3V PU 10K TO 3.3V
Power OK from main power supply. A high value indicates that the
power is good. This signal can be used to hold off Module startup to
allow Carrier based FPGAs or other configurable devices time to be
programmed.
SUS_STAT# B18 O CMOS 3.3V Suspend/3.3V Indicates imminent suspend operation; used to notify LPC devices.
SUS_S3# A15 O CMOS 3.3V Suspend/3.3V
Indicates system is in Suspend to RAM state. Active low output. An
inverted copy of SUS_S3# on the Carrier Board may be used to
enable the non-standby power on a typical ATX supply.
SUS_S4# A18 O CMOS 3.3V Suspend/3.3V Indicates system is in Suspend to Disk state. Active low output.
SUS_S5# A24 O CMOS 3.3V Suspend/3.3V Indicates system is in Soft Off state.
WAKE0# B66 I CMOS 3.3V Suspend/3.3V PU 1K TO 3.3VSB PCI Express wake up signal.
WAKE1# B67 I CMOS 3.3V Suspend/3.3V PU 10K TO 3.3VSB
General purpose wake up signal. May be used to implement wake-up
on PS2 keyboard or mouse activity.
BATLOW# A27 I CMOS 3.3V Suspend/ 3.3V PU 8.2K TO 3.3VSB
Indicates that external battery is low.
This port provides a battery-low signal to the Module for orderly
transitioning to power saving or power cut-off ACPI modes.
THRM# B35 I CMOS 3.3V / 3.3V PU 10K TO 3.3V Input from off-Module temp sensor indicating an over-temp situation.
THRMTRIP# A35 O CMOS 3.3V / 3.3V PU 10K TO 3.3V Active low output indicating that the CPU has entered thermal shutdown.
SMB_CK B13 I/O OD CMOS 3.3V Suspend/3.3V PU 2.2K TO 3.3VSB NC PU 4.7K TO 3.3VSB System Management Bus bidirectional clock line.
SMB_DAT B14 I/O OD CMOS 3.3V Suspend/3.3V PU 2.2K TO 3.3VSB NC PU 4.7K TO 3.3VSB System Management Bus bidirectional data line.
SMB_ALERT# B15 I CMOS 3.3V Suspend/3.3V System Management Bus Alert – active low input can be used to
generate an SMI# (System Management Interrupt) or to wake the system.
Signal Pin# Module Pin Type Pwr Rail /Tolerance HM920 Carrier Board Description
GPO0 A93
GPO1 B54
GPO2 B57
GPO3 B63
GPI0 A54 PU 100K to 3.3V
GPI1 A63 PU 100K to 3.3V
GPI2 A67 PU 100K to 3.3V
GPI3 A85 PU 100K to 3.3V
I CMOS 3.3V / 3.3V
General purpose input pins.
Pulled high internally on the Module.
Power and System Management Signals Descriptions
GPIO Signals Descriptions
O CMOS
General purpose output pins.
Upon a hardware reset, these outputs should be low.
3.3V / 3.3V
Miscellaneous Signal Descriptions