w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 17

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

1.6 FDC Interface
DRVDEN0
DRVDEN1
GP10
(IRQIN1)
P12
DIR
DSA
DSB
DSKCHG
SCI
HEAD
MOB
MOA
WE
WD
STEP
SYMBOL
PIN
10
11
12
13
14
15
16
2
3
5
9
4
OD
OD
OD
OD
OD
OD
OD
OD
OD
OD
OD
OD
IO
IO
IN
I/O
24t
24t
cs
24
24
12
24
24
24
24
24
24
24
24
24
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)
In the ACPI power management mode,
power management events.
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 K resistor. The resistor can be disabled by bit
7 of L0-CRF0 (FIPURDWN).
-16-
FUNCTION
Publication Release Date: April 1998
SCI
W83977ATF
PRELIMINARY
is driven low by the
Revision 0.52