LPC47M172-NR View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

LPC47M172-NR

Advanced I/O Controller with Motherboard GLUE Logic

SMSC -> Microchip 

Advanced I/O Controller with Motherboard GLUE Logic

Datasheet

PIN#

63

NAME

(NOTE 1)

nPCI_RESET

99

nIO_PME

9

nDSKCHG

10

nHDSEL

11

nRDATA

12

nWRTPRT

13

nTRK0

14

nWGATE

15

nWDATA

DESCRIPTION

Active low input used as LPC Interface

Reset. 3.3V and 5V buffered copy of PCI

Reset signal is available on

nPCIRST_OUT and nIDE_RSTDRV.

These pins are listed under GLUE PINS.

Power Management Event Output. This

active low Power Management Event

signal allows to request wakeup. This pin

can be configured as Push-Pull Output.

FDD INTERFACE (14)

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 Chapter

11 Configuration).

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.

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).

This active low Schmitt Trigger input

senses from the disk drive that the head

is positioned over the outermost track.

Write Gate Output. This active low high

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.

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.

BUFFER

NAME

(NOTE 2)

PCI_I

OD8

IS

O12

IS

IS

IS

O12

O12

PWR

WELL

(NOTE 3)

VCC

VTR

VCC

VCC

VCC

VCC

VCC

VCC

VCC

NOTES

SMSC/Non-SMSC Register Sets (Rev. 02-27-04)

Page 16

DATASHEET

SMSC LPC47M172

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