W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 20

• Manufacturer Part Number: W83977A
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

1.5 Multi-Mode Parallel Port, continued
PD0
PD1
PD2
STB
SYMBOL
PIN
36
31
30
29
OD
I/O
I/O
I/O
I/O
IN
IN
IN
IN
IN
IN
-
-
24t
24t
24t
12
t
t
t
t
t
t
PRINTER MODE: STB
An active low output is used to latch the parallel data into the
printer. This pin is pulled high internally. 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: PD0
Parallel port data bus bit 0. Refer to description of the parallel port
for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: INDEX2
This pin is for Extension FDD B; the function of this pin is the same
as the INDEX pin of FDC. It is pulled high internally.
EXTENSION 2FDD MODE: INDEX2
This pin is for Extension FDD A and B; the function of this pin is the
same as the INDEX pin of FDC. It is pulled high internally.
PRINTER MODE: PD1
Parallel port data bus bit 1. Refer to description of the parallel port
for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: TRAK02
This pin is for Extension FDD B; the function of this pin is the same
as the TRAK 0 pin of FDC. It is pulled high internally.
EXTENSION. 2FDD MODE: TRAK02
This pin is for Extension FDD A and B; the function of this pin is the
same as the TRAK 0 pin of FDC. It is pulled high internally.
PRINTER MODE: PD2
Parallel port data bus bit 2. Refer to description of the parallel port
for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: WP2
This pin is for Extension FDD B; the function of this pin is the same
as the WP pin of FDC. It is pulled high internally.
EXTENSION. 2FDD MODE: WP2
This pin is for Extension FDD A and B; the function of this pin is the
same as the WP pin of FDC. It is pulled high internally.
-12-
FUNCTION
Publication Release Date: April 1998
W83977TF
PRELIMINARY
Revision 0.62