User Guide • PC3-ALLEGRO • CompactPCI
®
PlusIO CPU Board • Intel® i7-3xxx Processor
GPIO Usage QM77 PCH
GPIO
Type
Tol.
Function
Description
GPIO 34
O
3.3V
EXP_SMB_EN
Connect SMBus on J-EXP to local SMBus
LOW: J-EXP disconnected from SMBus
HIGH: J-EXP connected to SMBus
GPIO 35
I
3.3V
CPCI_SMB_EN
Connect SMBus on CPCI to local SMBus
LOW: CPCI Backplane disconnected from SMBus
HIGH: CPCI Backplane connected to SMBus
GPIO36-37
-
3.3V
-
Not used, pulled to GND
GPIO 38
O
3.3V
SGPIO_LOAD
Serial GPIO Bus LOAD (Backplane J2)
GPIO 39
O
3.3V
SGPIO_OUT
Serial GPIO Bus DATAOUT (Backplane J2)
GPIO 40
I
3.3V
USB_OC1#
USB Front Panel Right Port Overcurrent Detect
GPIO 41
O
3.3V
ENABLE_NC3
Enable Ethernet Controller NC3
GPIO 42
O
3.3V
ENABLE_NC4
Enable Ethernet Controller NC4
GPIO 43
I
3.3V
USB_OC4#
USB J-HSE Port 1 Overcurrent Detect
GPIO 44
-
3.3V
-
Not used, pulled to GND
GPIO 45
O
3.3V
CLKOE_4J2
J2 PCIe4 clk enable, pulled to +V3.3A
GPIO 46
-
3.3V
-
Not used, pulled to GND
GPIO 47
O
3.3V
CLKOE_3J2
J2 PCIe3 clk enable, pulled to +V3.3A
GPIO 48-49
-
3.3V
-
Not used, pulled to GND
GPIO 50-52
-
3.3V
-
Not used, pulled to +V3.3S
GPIO 53
O
3.3V
CPCI_CLKBUF_EN
Enable CompactPCI Clock Buffer
GPIO 54
-
3.3V
-
Not used, pulled to +V3.3S
GPIO 55
O
3.3V
ENABLE_NC2
Enable Ethernet Controller NC2
GPIO 56
-
3.3V
-
Not used, pulled to GND
GPIO 57
O
3.3V
CPCI_INTS
LOW:
Isolate SERIRQ from CPCI_INTS
HIGH:
Connect SERIRQ to CPCI_INTS
GPIO 58
-
3.3V
-
Not used, pulled to +V3.3A
GPIO 59
I
3.3V
USB_OC0#
USB Front Panel Right Port Overcurrent Detect
GPIO 60
-
3.3V
-
Not used, pulled to +V3.3A
GPIO 61-62
-
3.3V
-
Not used
GPIO 63
O
3.3V
N/A
Multiplexed with chipset internal function
GPIO 64-67
I
HWREV
PCB Revision Code HW_REV[2:0]:
GPIO[67/66/64]
000
001
010 ...
100 ...
111
Revision 0
1
2
4
7
GPIO65
O
3.3V
CLK_14_EXP
Used as 14MHz Clock
GPIO 66
I
3.3V
HWREV
Used as HW_REV[1], see GPIO64
GPIO 67
I
3.3V
HWREV
Used as HW_REV[2], see GPIO64
GPIO68-71
I
N/A
N/A
Not used
GPIO 72
-
3.3V
-
Not used, pulled to +V3.3A
GPIO 73
I
3.3V
NC1_CLKREQ_#
Clock Enable Ethernet Controller NC1
GPIO 74-75
-
3.3V
-
Not used, pulled to +V3.3A
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