User manual

Advantech SOM-Express Design Guide
Chapter 5 Carrier Board Design Guidelines 73
TYPE2# TYPE1# TYPE0#
X X NC Pin-Out Type 1
NC NC GND Pin-Out Type 2
NC NC NC Pin-Out Type 3 (no IDE)
NC GND GND Pin-Out Type 4 (no PCI)
NC GND NC Pin-Out Type 5 (no
IDE,PCI)
The Carrier Board should implement combinatorial logic that
monitors the module TYPE pins and keeps power off (e.g.
deactivates the ATX_ON signal for an ATX power supply) if an
incompatible module pin-out type is detected. The Carrier
Board logic may also implement a fault indicator such as an
LED.
B12 PWRBTN# I
Power button to bring system out of S5 (soft off), active on
rising edge.
B49 SYS_RESET# I
Reset button input. Active low input. System is held in hardware
reset while this input is low, and comes out of reset upon
release.
B50 CB_RESET# O
Reset output from module to Carrier Board. Active low. Issued
by module chipset and may result from a low SYS_RESET#
input, a low PER_OK input, a VCC_12V power input that falls
below the minimum specification, a watch dog timeout, or may
be initiated by the module software.
B24 PWR_OK I
Power OK from main power supply. A high value indicates that
the power is good
B18 SUS_STAT# O
Indicates system suspend operation; used to notify LPC
devices.
A15 SUS_S3# O
Indicates system is in Suspend to RAM state. Active low output.
A18 SUS_S4# O
Indicates system is in Suspend to Disk state. Active low output.
A24 SUS_S5# O
Indicates system is in Soft Off state. Also known as “PS_ON”
and can be used to control an ATX power supply.
B66 WAKE0# I
PCI Express wake up signal.
B67 WAKE1# I
General purpose wake up signals. May be used to Implement
wake-up on PS2 keyboard or mouse activity.
A27 BATLOW# I
Indicates that external battery is low.
B35 THRM# I
Input from off-module temp sensor indicating an over-temp
situation.
A35 THRMTRIP# I
Active low output indicating that the CPU has entered thermal
shutdown.
VCC
Figure 5-38 Speaker Connections