W83977EF Datasheet, PDF (23/150 Pages) Winbond – WINBOND I/O

W83977EF
1.6 FDC Interface, continued
SYMBOL PIN
DSA#
14
I/O
OD₂₄
DSB#
15
OD₂₄
MOA#
16
OD₂₄
DSKCHG#
4
IN_cs
RDATA#
WP#
6
IN_cs
7
IN_cs
TRAK0#
8
IN_cs
INDEX#
17
IN_cs
FUNCTION
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).
Publication Release Date: April 2003
-17 -
Revision 1.1