W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 21
W83977A
Manufacturer Part Number
W83977A
Description
Winbond I/O
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977A.pdf
(160 pages)
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1.5 Multi-Mode Parallel Port, continued
PD3
PD4
PD5
PD6
SYMBOL
PIN
28
27
26
24
I/O
I/O
I/O
I/O
OD
I/O
IN
IN
IN
IN
-
-
-
24t
24t
24t
24t
t
t
t
t
24
PRINTER MODE: PD3
Parallel port data bus bit 3. Refer to description of the parallel port
for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: RDATA2
This pin is for Extension FDD B; the function of this pin is the same
as the RDATA pin of FDC. It is pulled high internally.
EXTENSION 2FDD MODE: RDATA2
This pin is for Extension FDD A and B; this function of this pin is the
same as the RDATA pin of FDC. It is pulled high internally.
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
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.
EXTENSION. 2FDD MODE: MOA2
This pin is for Extension FDD A; its function is the same as the
MOA pin of FDC.
-13 -
FUNCTION
Publication Release Date: April 1998
W83977TF
PRELIMINARY
Revision 0.62
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