W83877ATF Datasheet, PDF (18/191 Pages) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

W83877ATF
1.3 Multi-Mode Parallel Port, continued
SYMBOL PIN
I/O
PD6
16
I/O_24t
-
IOD₂₄
PD7
17
I/O_24t
-
OD₂₄
FUNCTION
PRINTER MODE: PD6
Parallel port data bus bit 6. Refer to the description of the
parallel port for the 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 that
of the MOA pin.
PRINTER MODE: PD7
Parallel port data bus bit 7. Refer to the description of the
parallel port for the 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 that
of the DSA pin.
1.4 FDC Interface
SYMBOL PIN
RDATA
74
DSKCHG
76
WP
77
TRAK0
78
I/O
FUNCTION
IN_cs The read data input signal from the FDD. This input pin is pulled
up internally by an approximately 1K ohm resistor. The resistor
can be disabled by bit 4 of CR6 (FIPURDWN).
IN_cs Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up
internally by an approximately 1K ohm resistor. The resistor can
be disabled by bit 4 of CR6 (FIPURDWN).
IN_cs Write protected. This active low schmitt input from the disk drive
indicates that the diskette is write-protected. This input pin is
pulled up internally by an approximately 1K ohm resistor. The
resistor can be disabled by bit 4 of CR6 (FIPURDWN).
IN_cs Track 0. This schmitt input from the disk drive is active low when
the head is positioned over the outermost track. This input pin is
pulled up internally by an approximately 1K ohm resistor. The
resistor can be disabled by bit 4 of CR6 (FIPURDWN).
- 14 -
Publication Release Date: April 1998
Version 0.51