LPC47M192 datasheet(13/228 Pages) SMSC

13 / 228 page

SMSC DS – LPC47M192

Page 13

Rev. 03/30/05

DATASHEET

QFP PIN#

NAME

DESCRIPTION

BUFFER

NAME

PWR

WELL

NOTES

nWDATA

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.

O12

VCC

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

nDIR

Step Direction Output. 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. Can be configured as

an Open-Drain Output.

O12

VCC

nSTEP

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

VCC

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

VCC

nDS0

Drive Select 0 Output. Can be configured as

an Open-Drain Output.

O12

VCC

nMTR0

Motor On 0 Output. Can be configured as

an Open-Drain Output.

O12

VCC

nWRTPRT

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).

VCC

nTRK0

This active low Schmitt Trigger input senses

from the disk drive that the head is

positioned over the outermost track.

VCC

nINDEX

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.

VCC

GP40/

DRVDEN0

General Purpose I/O

Drive Density Select 0 Output. Indicates the

drive and media selected.

Both functions can be configured as Open-

Drain Output.

IO12

VCC

GP41/

DRVDEN1

General Purpose I/O

Drive Density Select 1 Output. Indicates the

drive and media selected.

Both functions can be configured as Open-

Drain Output.

IO12

VCC

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