GENERAL PURPOSE I/O PINS
TABLE 3 - GENERAL PURPOSE I/O PIN FUNCTIONS
PIN NO.
QFP
DEFAULT
FUNCTION
ALTERNATE
FUNCTION 1
ALTERNATE
FUNCTION 2
ALTERNATE
FUNCTION 3
INDEX
REG.
BUFFER
TYPE5
GPIO
77
GPIO
nSMI
-
-
IOP4/(OP12/
OD12)
IOP4/I/I
IOP4/O4/IO4/I
IOP4/O24
IOP4/I
IOP4/O24
(O24/OD24)/
IOP4
GP1
GP10
78
79
80
81
82
4
GPIO
GPIO
GPIO
GPIO
GPIO
nMTR1
nRING
WDT
LED
IRRX2
IRTX2
GPIO
EETI1
-
GP1
GP1
GP1
GP1
GP1
GP1
GP11
GP12
GP13
GP14
GP15
GP16
P17/P124
EETI1
-
-
-
-
-
-
-
-
6
39
2
nDS1
GPIO
IRQ14
GPIO
-
-
(O24/OD24)/
IOP4
CLKIN/(O12/
OD12)/IOP4
(O24/OD24)
/IOP4/
GP1
GP5
GP5
GP17
GP50
GP52
PCI_CLK
DRVDEN1
GPIO
IRQ8
-
nSMI
(OP12/OD12)/
(OP12/OD12)
IO12/(O12/
OD12)/IOP4/I
IO12/(O12/
OD12)/IOP4/I
IO12/(O12/
OD12)/IOP4/
(OP12/OD12)
IO12/(O12/
OD12)/IOP4/
O24
IO12/(O12/
OD12)/IOP4/I
IO12/(O12/
OD12)/IOP4/
O4
IO12/(O12/
OD12)/IOP4/
IO4
IO12/(O12/
OD12)/IOP4
IO12/(OP12/
OD12)/IOP4
IO12/(O12/
OD12)/IOP4
91
92
83
nROMCS2
nROMOE2
RD02,3
IRQ11
IRQ12
IRQ1
GPIO
GPIO
GPIO
EETI1
EETI1
nSMI
GP5
GP5
GP6
GP53
GP54
GP60
84
RD12,3
IRQ3
GPIO
LED
GP6
GP61
85
86
RD22,3
RD32,3
IRQ4
IRQ5
GPIO
GPIO
nRING
WDT
GP6
GP6
GP62
GP63
87
RD42,3
IRQ6
GPIO
P17/P124
GP6
GP64
88
89
90
RD52,3
RD62,3
RD72,3
IRQ7
IRQ8
IRQ10
GPIO
GPIO
GPIO
-
-
-
GP6
GP6
GP6
GP65
GP66
GP67
Note 1: Either Edge Triggered Interrupt Inputs.
Note 2: At power-up, RD0-7, nROMCS and nROMOE function as the XD Bus. To use RD0-7 for alternate
functions, nROMCS must stay high until those pins are finished being programmed.
Note 3: These pins cannot be programmed as open drain pins in their original function.
11
SMSC [ SMSC CORPORATION ]
