w83977eg Winbond Electronics Corp America, w83977eg Datasheet - Page 19

• Manufacturer Part Number: w83977eg
• Description: Winbond Isa I/o W83977ef W83977eg
• Manufacturer: Winbond Electronics Corp America

4.6
DRVDEN0
DRVDEN1
GP10
(IRQIN1)
P12
SCI#
HEAD#
WE#
WD#
STEP#
DIR#
MOB#
DSA#
DSB#
MOA#
DSKCHG#
RDATA#
WP#
TRAK0#
INDEX#
SYMBOL
FDC Interface
PIN
10
12
13
14
15
16
17
11
4
6
2
3
5
9
7
8
OUT
OD24
OD24
OD
OD
OD
OD
OD
OD
OD
OD
OD
IO
IO
IN
IN
IN
IN
IN
I/O
24t
24t
cs
cs
cs
cs
cs
24
24
24
24
24
24
24
24
24
12t
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.
Drive Select A. When set to 0, this pin enables disk drive A. This
is an open drain output.
Drive Select B. When set to 0, this pin enables disk drive B. This
is an open drain output.
Motor A On. When set to 0, this pin enables disk drive 0. This is
an open drain output.
Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up
internally by a 1 KΩ resistor. The resistor can be disabled by bit 7
of L0-CRF0 (FIPURDWN).
The read data input signal from the FDD. This input pin is pulled
up internally by a 1 KΩ resistor. The resistor can be disabled by
bit 7 of L0-CRF0 (FIPURDWN).
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 a 1 KΩ resistor. The resistor can be
disabled by bit 7 of L0-CRF0 (FIPURDWN).
Track 0. This Schmitt-triggered 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 a 1 KΩ resistor. The resistor
can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
This Schmitt-triggered input from the disk drive is active low
when the head is positioned over the beginning of a track marked
by an index hole. This input pin is pulled up internally by a 1 KΩ
resistor. The resistor can be disabled by bit 7 of L0-CRF0
(FIPURDWN).
W83977EF-AW/W83977EG-AW
-17-
FUNCTION
Publication Release Date: Apr. 2006
Revision 1.2