W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 26

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

1.5 Multi-Mode Parallel Port, continued
PD4
PD5
PD6
PD7
SYMBOL
PIN
27
26
24
23
I/O
I/O
I/O
OD
I/O
OD
I/O
IN
IN
-
-
-
-
24t
24t
24t
24t
24
24
t
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
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
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
MOA pin of FDC.
DSA pin of FDC.
W83977F/ W83977AF
FUNCTION
Publication Release Date: March 1998
PRELIMINARY
-15 -
Revision 0.58