
W83627UHG
Publication Release Date: March 24, 2008
-4-
Revision 1.44
SYMBOL
PIN
I/O
DESCRIPTION
DIR#
OD
24
Direction of the head step motor. An open-drain output.
Logic 1 = outward motion
Logic 0 = inward motion
DTRF#
9
O
24
UART F Data Terminal Ready. An active low signal informs the
modem or data set that the controller is ready to communicate.
STEP#
OD
24
Step output pulses. This active-low open-drain output produces
a pulse to move the head to another track.
SINF
10
IN
t
Serial Input. This pin is used to receive serial data through the
communication link.
WD#
OD
24
Write data. This logic-low open-drain writes pre-compensation
serial data to the selected FDD. An open-drain output.
SOUTF
11
O
24
UART F Serial Output. This pin is used to transmit serial data
out to the communication link.
WE#
OD
24
Write enable. An open-drain output.
DCDF#
13
IN
t
Data Carrier Detect. An active low signal indicates the modem
or data set has detected a data carrier.
TRAK0#
IN
tsu
Track 0. This Schmitt-trigger input from the disk drive is active-
low when the head is positioned over the outermost track. This
input pin needs to connect a pulled-up 1-K
Ω resistor to 5V for
Floppy Drive compatibility.
GP63
14
I/OD
12ts
General purpose I/O port 6 bit 3.
WP#
IN
tsu
Write Protected. This active-low Schmitt input from the disk
drive indicates that the diskette is write-protected. This input pin
needs to connect a pulled-up 1-K
Ω resistor to 5V for Floppy
Drive compatibility.
GP62
15
I/OD
12ts
General purpose I/O port 6 bit 2.
RDATA#
IN
tsu
The read-data input signal from the FDD. This input pin needs to
connect a pulled-up 1-K
Ω resistor to 5V for Floppy Drive
compatibility.
GP61
16
I/OD
12ts
General purpose I/O port 6 bit 1.
HEAD#
OD
24
Head Select. This open-drain output determines which disk
drive head is active.
Logic 1 = side 0
Logic 0 = side 1
RIF#
17
IN
t
Ring Indicator. An active low signal indicates that a ring signal
is being received from the modem or data set.