Buffer
Type
Index
Register
Pin
No.
108
Original
Alternate
Alternate
Alternate
Function Function 1 Function 2 Function 3
Default
input
GPI/O
GP23
Serial
EEPROM
Clock
Serial
EEPROM
Enable
GPI/O
GPI/O
GPI/O
-
-
-
-
-
-
I/O4
I/O4
I/O4
GP2
GP2
GP2
109
110
input
input
GP24
GP25
8042 P21
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.
11
SMSC [ SMSC CORPORATION ]
