
W83977F/ W83977AF
PRELIMINARY
Publication Release Date: March 1998
-15 -
Revision 0.58
1.5 Multi-Mode Parallel Port, continued
SYMBOL
PD4
PIN
27
I/O
I/O
24t
FUNCTION
IN
t
IN
t
PRINTER MODE: PD4
Parallel port data bus bit 4. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: DSKCHG2
This pin is for Extension FDD B; the function of this pin is the
same as the DSKCHG pin of FDC. It is pulled high internally.
EXTENSION 2FDD MODE: DSKCHG2
This pin is for Extension FDD A and B; this function of this pin is
the same as the
DSKCHG
pin of FDC. It is pulled high
internally.
PRINTER MODE: PD5
Parallel port data bus bit 5. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: This pin is a tri-state output.
EXTENSION 2FDD MODE: This pin is a tri-state output.
PRINTER MODE: PD6
PD5
26
I/O
24t
-
-
PD6
24
I/O
24t
Parallel port data bus bit 6. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode.
-
EXTENSION FDD MODE: This pin is a tri-state output.
OD
24
EXTENSION. 2FDD MODE: MOA2
This pin is for Extension FDD A; its function is the same as the
MOA pin of FDC.
PD7
23
I/O
24t
-
OD
24
PRINTER MODE: PD7
Parallel port data bus bit 7. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: This pin is a tri-state output.
EXTENSION 2FDD MODE: DSA2
This pin is for Extension FDD A; its function is the same as the
DSA pin of FDC.