Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
BUFFER
NAME
PWR
WELL
NAME
PIN#
DESCRIPTION
NOTES
(NOTE 1)
(NOTE 2)
(NOTE 3)
99
nIO_PME
Power Management Event Output. This
active low Power Management Event
signal allows to request wakeup. This pin
can be configured as Push-Pull Output.
OD8
VTR
FDD INTERFACE (14)
9
nDSKCHG
This input senses that the drive door is
open or that the diskette has possibly
been changed since the last drive
selection. This input is inverted and read
via bit 7 of I/O address 3F7H. The
nDSKCHG bit also depends upon the
state of the Force Disk Change bits in the
Force Disk Change register (see section
Chapter 11 Configuration).
IS
VCC
10
nHDSEL
Head Select Output. This high current
output selects the floppy disk side for
reading or writing. A logic “1” on this pin
means side 0 will be accessed, while a
logic “0” means side 1 will be accessed.
Can be configured as an Open-Drain
Output.
O12
VCC
11
12
nRDATA
Raw serial bit stream from the disk drive,
low active. Each falling edge represents
a flux transition of the encoded data.
This active low Schmitt Trigger input
senses from the disk drive that a disk is
write protected. Any write command is
ignored. The nWRPRT bit also depends
upon the state of the Force Write Protect
bit in the FDD Option register (see the
Configuration Registers section).
IS
IS
VCC
VCC
nWRTPRT
13
14
nTRK0
This active low Schmitt Trigger input
senses from the disk drive that the head
is positioned over the outermost track.
IS
VCC
VCC
nWGATE
Write Gate Output. This active low high
O12
current driver allows current to flow
through the write head. It becomes active
just prior to writing to the diskette. Can be
configured as an Open-Drain Output.
15
16
nWDATA
nSTEP
Write Disk Data Output. This active low
high current driver provides the encoded
data to the disk drive. Each falling edge
causes a flux transition on the media.
Can be configured as an Open-Drain
Output.
Step Pulse Output. This active low high
current driver issues a low pulse for each
track-to-track movement of the head.
Can be configured as an Open-Drain
Output.
O12
O12
VCC
VCC
SMSC LPC47M182
15
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
DATASHEET
SMSC [ SMSC CORPORATION ]
