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LPC47N227TQFP

100 Pin Super I/O with LPC Interface for Notebook Applications

SMSC -> Microchip 

TQFP/STQFP

PIN #

NAME

5

Drive Select 0

8

Direction

Control

9

Step Pulse

10

Write Data

11

Write Gate

12

Head

Select

13

Index

14

Track 0

15

Write

Protected

16

Read Disk Data

84

Receive Data 1

85

Transmit

Data 1

BUFFER

SYMBOL

TYPE PER

FUNCTION1

DESCRIPTION

nDS0

(O12/OD12) Active low output selects drive 0.

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.

nSTEP

(O12/OD12) This active low high current driver issues a

low pulse for each track-to-track

movement of the head.

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.

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.

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.

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.

nTRK0

IS

This active low Schmitt Trigger input

senses from the disk drive that the head is

positioned over the outermost track.

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).

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

RXD1

IS

Receiver serial data input for port 1.

TXD1

O12

Transmit serial data output for port 1.

6

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