W83627HF/ F/ HG/ G
6.2
FDC Interface
SYMBOL
DRVDEN0
PIN
I/O
FUNCTION
1
OD24
Drive Density Select bit 0.
DRVDEN1
SMI#
2
OD12
OD12
INt
Drive Density Select bit 1.（Default）
System Management Interrupt
Interrupt channel input.
IRQIN1
GP27
I/OD12t General purpose I/O port 2 bit 7.
INDEX#
3
INcsu
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 500 ohm resistor. The resistor can be disabled by bit 7 of
LD0-CRF0（FIPURDWN）.
MOA#
DSB#
4
5
OD24
OD24
I/O24ts
OD24
Motor A On. When set to 0, this pin enables disk drive 0.
Drive Select B. When set to 0, this pin enables disk drive B.
0V to +5V amplitude fan tachometer input
FANIN3
DSA#
6
7
Drive Select A. When set to 0, this pin enables disk drive A.
Motor B On. When set to 0, this pin enables disk drive 1.
MOB#
OD24
OD24
FANPWM3
Fan speed control. Use the Pulse Width Modulation（PWM）
technical knowledge to control the Fan's RPM.
DIR#
8
OD24
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
STEP#
WD#
9
OD24
OD24
Step output pulses. This active low open drain output produces
a pulse to move the head to another track.
10
Write data. This logic low open drain writes pre-compensation
serial data to the selected FDD. An open drain output.
WE#
11
13
OD24
INcsu
Write enable. An open drain output.
TRACK0#
Track 0. This Schmitt-triggered input from the disk drive is ac-
tive low when the head is positioned over the outermost track.
This input pin is pulled up internally by a 1 K ohm resistor.The
resistor can be disabled by bit 7 of L0-CRF0（FIPURDWN）.
WP#
14
INcsu
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 ohm resistor. The resistor can
be disabled by bit 7 of L0-CRF0 （FIPURDWN）.
- 14 -
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