The FDC37C93xFR also has 28 GPI/O ports
that are the first alternate functions of pins
with other default functions. These pins are
listed in Table 50B below.
Table 50B - Multifunction GPI/O Pins
PIN
NUMBER
ORIGINAL
FUNCTION
MEDIA_ID1
MEDIA_ID0
nIDE1_OE
nHDCS0
nHDCS1
IDE1_IRQ
nIOROP
ALTERNATE
FUNCTION 1
GP40
ALTERNATE
FUNCTION 2
ALTERNATE GPI/O REGISTER
FUNCTION 3
ASSIGNMENT
GP4, bit 0
GP4, bit 1
GP4, bit 2
GP4, bit 3
GP4, bit 4
GP4, bit 5
GP4, bit 6
19
20
23
24
25
26
30
IR Mode
IRR3
-
GP41
GP42
GP43
GP44
GP45
GP46
-
-
-
-
-
-
-
-
-
Power LED
Output
WDT
31
33
34
nIOWOP
nPowerOn
Button_In
RD0 (1) (3)
GP47
GP51
GP50
GP60
nSMI
-
-
-
-
-
-
GP4, bit 7
GP5, bit 1
GP5, bit 0
GP6, bit 0
Power LED
Output
111
112
113
114
115
116
117
118
119
120
153
154
155
156
157
158
159
160
RD1 (1) (3)
RD2 (1) (3)
RD3 (1) (3)
RD4 (1) (3)
RD5 (1) (3)
RD6 (1) (3)
RD7 (1) (3)
nROMCS (1)
nROMOE (1)
nRI2 (2)
GP61
GP62
GP63
GP64
GP65
GP66
GP67
GP53
GP54
GP70
GP71
GP72
GP73
GP74
GP75
GP76
GP77
WDT
8042 - P12
8042 - P13
8042 - P14
8042 - P15
8042 - P16
8042 - P17
-
-
-
-
-
-
-
-
GP6, bit 1
GP6, bit 2
GP6, bit 3
GP6, bit 4
GP6, bit 5
GP6, bit 6
GP6, bit 7
GP5, bit 3
GP5, bit 4
GP7, bit 0
GP7, bit 1
GP7, bit 2
GP7, bit 3
GP7, bit 4
GP7, bit 5
GP7, bit 6
GP7, bit 7
-
IR Mode
IRR3
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
nDCD2 (2)
RXD2 (2)
TXD2 (2) (3)
nDSR2 (2)
nRTS2 (2)(3)
nCTS2 (2)
nDTR2 (2)(3)
Note 1:
At power-up, RD0-RD7, nROMCS and nROMOE function as the XD Bus. To use RD0-
RD7 for functions other than the XD Bus, nROMCS must stay high until those pins are
finished being reprogrammed.
Note 2:
Note 3:
Note:
These pins are input (high-z) until programmed for second serial port.
These pins cannot be programmed as open drain pins in their original function.
No pins in their original function can be programmed as inverted input or inverted output.
121
SMSC [ SMSC CORPORATION ]
