PC4-PRESTO • CompactPCI
®
PlusIO • 4
th
Generation Intel
®
Core™-4xxx Processor
GPIO Usage
GPIO Usage QM87 PCH
GPIO Usage QM87 PCH
GPIO
Type
Voltage
1)
Function
Description
0
I
+V3.3S
THRM_ALERT#
Monitoring of processor PROCHOT#
1
I
+V3.3S
EXP_SMI#
Expansion Interface SMI Request (P-EXP Pin 15)
2
I
+V3.3S
CPCI_INTP
CompactPCI Interrupt Request Line CPCI_INTP
3
I
+V3.3S
CPCI_ENUM#
CompactPCI System Enumeration Line ENUM#
4
I
+V3.3S
CPCI_PS_FAL_ON#
CompactPCI Power Failure Line CPCI_FAL#/PS_ON#
5
I
+V3.3S
PM_MEMTS#
Memory Thermal Sensor Event
6
I
+V3.3S
N/A
Not used on PC4 (pulled via resistor to GND)
7
I
+V3.3S
GP_JUMP#
Reset UEFI BIOS Setup to Factory Defaults, Jumper J-GP
8
O
+V3.3A
CPCI_SYSEN_#
Sense CompactPCI
®
System Slot Enable Line SYSEN#
9
I
+V3.3A
USB_OC5#
USB P-HSE Port 2 Overcurrent Detect
10
I
+V3.3A
USB_OC6#
USB P-HSE Port 3 or 4 Overcurrent Detect
11
I
+V3.3A
NV-GP1
Non-Volatile Jumper
12
O
+V3.3A
NC1_ENABLE
Enable Ethernet Controller NC1
13
I
+V3.3A
HM_INT#
Hardware Monitor LM87 Interrupt Line
14
I
+V3.3A
USB_OC7#
USB P-EXP Port 1 or 2 Overcurrent Detect
15
O
+V3.3A
N/A
Not connected on PC4
16
O
+V3.3S
SE_SYS_WP
General Purpose Serial EEPROM Write Protection
17
I
+V3.3S
PPSM_EN
Connect IEEE 1588 PPS/PPM to J-GP and CompactPCI
®
J2
LOW: PPS/PPM disconnected from J-GP and J2
HIGH: PPS/PPM connected to J-GP and J2
18
O
+V3.3S
GP_LED_RED
General Purpose Red LED Control (via PLD)
19
I
+V3.3S
N/A
One of the Config Straps for boot device selection, pulled
to +V3.3S..
20
I
+V3.3S
PCIE_CLK_REQ2#
CompactPCI
®
PlusIO Clock Request (CLKOE_4J2#)
21
I
+V3.3S
N/A
Not used on PC4 (pulled via resistor to GND)
22
O
+V3.3S
SGPIO_CLOCK
CompactPCI PLusIO GPIO Bus CLOCK (J2_ SATA_SCL)
23
I
+V3.3S
N/A
Not connected on PC4
24
O
+V3.3A
USB_POWEN1#
USB Front Panel Right Port Power Enable
25
I
+V3.3A
PCIE_CLK_REQ3#
CompactPCI
®
PlusIO Clock Request (CLKOE_1J2#)
26
I
+V3.3A
PCIE_CLK_REQ4#
Clock Request received from internal PCIe Switch
27
I
+V3.3A
NC1_WAKE#
Ethernet Controller NC1 WAKE#
28
O
+V3.3A
USB_POWEN2#
USB Front Panel Left Port Power Enable
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