
W83697HF
Publication Release Date:Feb. 2002
Revision 0.70
- 7 -
1.2 FDC Interface
SYMBOL
PIN
I/O
FUNCTION
DRVDEN0
1
OD
24
Drive Density Select bit 0.
INDEX#
2
IN
cs
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 K
resistor. The resistor can be disabled by bit 7 of L0-CRF0
(FIPURDWN).
MOA#
3
OD
24
Motor A On. When set to 0, this pin enables disk drive 0. This is
an open drain output.
DSB#
4
OD
24
Drive Select B. When set to 0, this pin enables disk drive B. This
is an open drain output.
DSA#
6
OD
24
Drive Select A. When set to 0, this pin enables disk drive A. This
is an open drain output.
MOB#
7
OD
24
Motor B On. When set to 0, this pin enables disk drive 1. This is
an open drain output.
DIR#
8
OD
24
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
STEP#
9
OD
24
Step output pulses. This active low open drain output produces a
pulse to move the head to another track.
WD#
10
OD
24
Write data. This logic low open drain writes pre-compensation
serial data to the selected FDD. An open drain output.
WE#
11
OD
24
Write enable. An open drain output.
TRAK0#
12
IN
cs
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 K
resistor. The resistor
can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
WP#
13
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 a 1 K
resistor. The resistor can be
disabled by bit 7 of L0-CRF0 (FIPURDWN).
RDATA#
14
IN
cs
The read data input signal from the FDD. This input pin is pulled
up internally by a 1 K
resistor. The resistor can be disabled by
bit 7 of L0-CRF0 (FIPURDWN).