w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 26

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

1.6 FDC Interface, continued
DSA#
DSB#
MOA#
DSKCHG#
RDATA#
WP#
TRAK0#
INDEX#
SYMBOL
PIN
14
15
16
17
4
6
7
8
OD
OD
OD
IN
IN
IN
IN
IN
I/O
cs
cs
cs
cs
cs
24
24
24
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).
The read data input signal from the FDD. This input pin is pulled
up internally by a 1 K
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 K
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 K
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 K
(FIPURDWN).
resistor. The resistor can be disabled by bit 7 of L0-CRF0
-17 -
resistor. The resistor can be disabled by
FUNCTION
Publication Release Date: March 1999
resistor. The resistor can be
W83977EF/ CTF
PRELIMINARY
resistor. The
Revision A1