W83627EHF Datasheet, PDF (16/141 Pages) Winbond – evolving product from Winbonds most popular I/O family

W83627EHF/EF, W83627EHG/EG
5.2 FDC Interface
SYMBOL PIN I/O
FUNCTION
DRVDEN0 1 OD₂₄ Drive Density Select bit 0.
INDEX#
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.
3 ^IN_csu This input pin can be pulled up internally by a 1 KΩ(±50%). The resistor
also can be disabled/enabled by bit 7 of LD0-CRF0(FIPURDWN). Default
is disabled.
MOA#
4
OD₂₄
Motor A On. When set to 0, this pin enables disk drive 0. This is an open
drain output.
DSA#
6
OD₂₄
Drive Select A. When set to 0, this pin enables disk drive A. This is an
open drain output.
DIR#
Direction of the head step motor. An open drain output.
8 OD₂₄ Logic 1 = outward motion
Logic 0 = inward motion
STEP#
9
OD₂₄
Step output pulses. This active low open drain output produces a pulse
to move the head to another track.
WD#
10
OD₂₄
Write data. This logic low open drain writes pre-compensation serial data
to the selected FDD. An open drain output.
WE#
11 OD₂₄ Write enable. An open drain output.
TRAK0#
Track 0. This Schmitt-triggered input from the disk drive is active low
13
IN_csu
when the head is positioned over the outermost track. This input pin can
be pulled up internally by a 1 KΩ( ± 50%). The resistor also can be
disabled/enabled by bit 7 of LD0-CRF0(FIPURDWN). Default is disabled.
WP#
Write protected. This active low Schmitt input from the disk drive
14
IN_csu
indicates that the diskette is write-protected. This input pin can be pulled
up internally by a 1 KΩ(±50%). The resistor also can be disabled/enabled
by bit 7 of LD0-CRF0(FIPURDWN). Default is disabled.
RDATA#
The read data input signal from the FDD. This input pin can be pulled up
15 IN_csu internally by a 1 KΩ(±50%). The resistor also can be disabled/enabled by
bit 7 of LD0-CRF0(FIPURDWN). Default is disabled.
HEAD#
Head select. This open drain output determines which disk drive head is
active.
16 ^OD_{24 Logic 1 = side 0}
Logic 0 = side 1
Diskette change. This signal is active low at power on and whenever the
DSKCHG#
17
IN_csu
diskette is removed. This input pin can be pulled up internally by a 1 KΩ(
±50%) . The resistor also can be disabled/enabled by bit 7 of LD0-CRF0
(FIPURDWN). Default is disabled.
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