FDC37CXFR Datasheet, PDF (11/258 Pages) SMSC Corporation – Plug and Play Compatible Ultra I/O Controller with Fast IR

Pin Original Alternate Alternate Alternate Buffer
No. Function Function 1 Function 2 Function 3 ^Type
108 GPI/O
Serial
-
EEPROM
-
I/O4
Clock
109 GPI/O
Serial
-
EEPROM
-
I/O4
Enable
110 GPI/O 8042 P21
-
-
I/O4
Default
input
input
input
Index
Register
GP2
GPI/O
GP23
GP2 GP24
GP2 GP25
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: These pins are input (high-z) until programmed for second serial port.
Note 3: This is the trickle voltage input pin for the FDC37C93xFR.
Note 4: These pins cannot be programmed as open drain pins in their original function.
Note 5: No pins in their original function can be programmed as inverted input or inverted output.
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