PC4-PRESTO • CompactPCI
®
PlusIO • 4
th
Generation Intel
®
Core™-4xxx Processor
GPIO Usage QM87 PCH
GPIO
Type
Voltage
1)
Function
Description
29
O
+V3.3A
N/A
Not connected on PC4
30-31
I
+V3.3A
N/A
Not used on PC4 (pulled via resistors to +3.3V)
32
I
+V3.3S
N/A
Not used on PC4 (pulled via resistor to +3.3V)
33
O
+V3.3S
N/A
Not connected on PC4
34
O
+V3.3S
EXP_SMB_EN
Connect SMBus on P-EXP to local SMBus
LOW: P-EXP disconnected from SMBus
HIGH: P-EXP connected to SMBus
35
O
+V3.3S
CPCI_SMB_EN
Connect SMBus on CompactPCI PlusIO to local SMBus
LOW: CPCI Backplane disconnected from SMBus
HIGH: CPCI Backplane connected to SMBus
36
I
+V3.3S
N/A
Not used on PC4 (pulled via resistor to GND)
37
I
+V3.3S
N/A
Not used on PC4 (pulled via resistor to +3.3V)
38
O
+V3.3S
SGPIO_LOAD
CompactPCI PlusIO GPIO Bus LOAD (J2_SATA_SCL)
39
O
+V3.3S
SGPIO_OUT
CompactPCI PlusIO GPIO Bus DATAOUT (J2_SATA_SDO)
40
I
+V3.3A
USB_OC1#
USB Front Panel Left Port Overcurrent Detect
41
O
+V3.3A
ENABLE_NC3
Enable Ethernet Controller NC3
42
O
+V3.3A
ENABLE_NC4
Enable Ethernet Controller NC4
43
I
+V3.3A
USB_OC4#
USB P-HSE Port 1 Overcurrent Detect
44
I
+V3.3A
PCIE_CLK_REQ5#
CompactPCI
®
PlusIO Clock Request (CLKOE_3J2#)
45
I
+V3.3A
PCIE_CLK_REQ6#
CompactPCI
®
PlusIO Clock Request (CLKOE_2J2#)
46
I
+V3.3A
PCIE_CLK_REQ7#
Clock Request received from PCIe to PCI bridge for J1
47
I
+V3.3A
PEG_A_CLK_RQ#
Clock Request received from PCIe clock buffer
48
I
+V3.3S
CPCI_INTS_EN
LOW: Isolate SERIRQ from CPCI_INTS
HIGH: Connect SERIRQ to CPCI_INTS
49
I
+V3.3S
N/A
Not used on PC4 (pulled via resistors to GND)
50
I
+V3.3S
HWREV
PCB Revision Code HWREV[2:0]:
GPIO[54/52/50] 000
001
010
...
111
Revision
0
1
2
...
7
51
O
+V3.3S
N/A
One of the Config Straps for boot device selection, pulled
to +V3.3S.
52
I
+V3.3S
N/A
PCB Revision Code HWREV[2:0], see GPIO50
53
O
+V3.3S
N/A
Not connected on PC4
54
I
+V3.3S
N/A
PCB Revision Code HWREV[2:0], see GPIO50
55
O
+V3.3S
ENABLE_NC2
Enable Ethernet Controller NC2
56
I
+V3.3A
N/A
Not used on PC4 (pulled via resistor to GND)
57
I
+V3.3A
N/A
TPM2.0 Physical Present Pin
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