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LPC47N227 Datasheet(PDF) 6 Page - SMSC Corporation

Part # LPC47N227
Description  100 Pin Super I/O with LPC Interface for Notebook Applications
Download  202 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LPC47N227 Datasheet(HTML) 6 Page - SMSC Corporation

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6
TQFP/STQFP
PIN #
NAME
SYMBOL
BUFFER
TYPE PER
FUNCTION
1
DESCRIPTION
5
Drive Select 0
nDS0
(O12/OD12)
Active low output selects drive 0.
8
Direction
Control
nDIR
(O12/OD12)
This high current low active output
determines the direction of the head
movement. A logic “1” on this pin means
outward motion, while a logic “0” means
inward motion.
9
Step Pulse
nSTEP
(O12/OD12)
This active low high current driver issues a
low
pulse
for
each
track-to-track
movement of the head.
10
Write Data
nWDATA
(O12/OD12)
This active low high current driver provides
the encoded data to the disk drive. Each
falling edge causes a flux transition on the
media.
11
Write Gate
nWGATE
(O12/OD12)
This active low high current driver allows
current to flow through the write head. It
becomes active just prior to writing to the
diskette.
12
Head
Select
nHDSEL
(O12/OD12)
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.
13
Index
nINDEX
IS
This active low Schmitt Trigger input
senses from the disk drive that the head is
positioned over the beginning of a track, as
marked by an index hole.
14
Track 0
nTRK0
IS
This active low Schmitt Trigger input
senses from the disk drive that the head is
positioned over the outermost track.
15
Write
Protected
nWRTPRT
IS
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 Force FDD Status Change
configuration register (see subsection
CR17 in the Configuration section).
16
Read Disk Data
nRDATA
IS
Raw serial bit stream from the disk drive,
low active. Each falling edge represents a
flux transition of the encoded data.
SERIAL PORTS INTERFACE
84
Receive Data 1
RXD1
IS
Receiver serial data input for port 1.
85
Transmit
Data 1
TXD1
O12
Transmit serial data output for port 1.


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