W83627THF_06 Datasheet, PDF (17/142 Pages) Winbond – Winbond LPC I/O

W83627THF/W83627THG
3.2 FDC Interface
SYMBOL
DRVDEN0
PIN
1
I/O
OD₂₄
INDEX#
3
IN_cs
MOA#
DSA#
DIR#
STEP#
WD#
WE#
TRAK0#
4
OD₂₄
6
OD₂₄
8
OD₂₄
9
OD₂₄
10
OD₂₄
11
OD₂₄
13
IN_cs
WP#
14
IN_cs
RDATA#
15
IN_cs
HEAD#
16
OD₂₄
DSKCHG# 17
IN_cs
FUNCTION
Drive Density Select bit 0.
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).
Motor A On. When set to 0, this pin enables disk drive 0. 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.
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
Step output pulses. This active low open drain output produces a
pulse to move the head to another track.
Write data. This logic low open drain writes pre-compensation
serial data to the selected FDD. An open drain output.
Write enable. An open drain output.
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).
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).
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).
Head select. This open drain output determines which disk drive
head is active.
Logic 1 = side 0
Logic 0 = side 1
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 . The resistor can be disabled by bit 7 of
L0-CRF0 (FIPURDWN).
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