w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 25

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

1.5 Multi-Mode Parallel Port, continued
1.6 FDC Interface
PD7
DRVDEN0
DRVDEN1
GP10
(IRQIN1)
P12
SCI#
HEAD#
WE#
WD#
STEP#
DIR#
MOB#
SYMBOL
SYMBOL
PIN
PIN
10
11
12
13
23
2
3
5
9
OUT
OD
OD
OD
OD
OD
OD
OD
OD
I/O
OD
IO
IO
I/O
I/O
-
12t
12t
12t
24
12
24
24
24
24
24
24
12
12t
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.
Drive Density Select bit 0.
Drive Density Select bit 1. (CR2A bit 1_0 = 00, default)
General purpose I/O port 1 bit 0. (CR2A bit 1_0 = 01)
Alternate Function from GP10: Interrupt channel input.
KBC P12 I/O port. (CR2A bit 1_0 = 10)
System Control Interrupt (CR2A bit 1_0 = 11)
Head select. This open drain output determines which disk drive
head is active.
Logic 1 = side 0
Logic 0 = side 1
Write enable. An open drain output.
Write data. This logic low open drain writes pre-compensation
serial data to the selected FDD. An open drain output.
Step output pulses. This active low open drain output produces
a pulse to move the head to another track.
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
Motor B On. When set to 0, this pin enables disk drive 1. This is
an open drain output.
-16 -
FUNCTION
FUNCTION
Publication Release Date: March 1999
W83977EF/ CTF
PRELIMINARY
Revision A1