FDC37N869 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37N869

5V and 3.3V Super I/O Controller with Infrared Support for Portable Applications

SMSC -> Microchip 

TQFP

PIN #

8

7

9

5

6

15

2

100

99

12

11

10

16

86

87

76

NAME

nWrite

Gate

nWrite

Data

nHead

Select

Direction

Control

nStep Pulse

Disk

Change

nDrive

Select 0

nMotor On 0

Drive

Density 0

nWrite

Protected

wTrack 00

nIndex

Drive

Density 1

Receive

Data 2

Transmit

Data 2

(Note 5)

Receive

Data 1

SYMBOL

nWGATE

nWDATA

nHDSEL

nDIR

nSTEP

nDSKCHG

nDS0

nMTR0

DRVDEN0

nWRTPRT

nTRK0

nINDEX

DRVDEN 1

RXD2

TXD2

RXD1

BUFFER

MODE6

DESCRIPTION

(O12/ This active low high current driver allows current

OD12) to flow through the write head. It becomes active

just prior to writing to the diskette.

(O12/ This active low high current driver provides the

OD12) encoded data to the disk drive. Each falling

edge causes a flux transition on the media.

(O12/ This high current output selects the floppy disk

OD12) 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.

(O12/ This high current low active output determines

OD12) the direction of the head movement. A logic “1”

on this pin means outward motion, while a logic

“0” means inward motion.

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

OD12) pulse for each track-to-track movement of the

head.

IS

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 FDD

Status Change configuration register (see

section CR17 on page 109).

(O12/ Active low output selects drive 0.

OD12)

(O12/ These active low output selects motor drive 0.

OD12)

(O12/ Indicates the drive and media selected. Refer to

OD12) configuration registers CR03, CR0B, CR1F.

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 section CR17 on

page 109).

IS

This active low Schmitt Trigger input senses

from the disk drive that the head is positioned

over the outermost track.

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.

(O12/ Indicates the drive and media selected. Refer to

OD12) configuration registers CR03, CR0B, CR1F.

SERIAL PORTS INTERFACE

IS

Receiver serial data input for port 2. IR Receive

Data

O12PD Transmit serial data output for port 2. IR

transmit data.

I

Receiver serial data input for port 1.

SMSC DS – FDC37N869

Page 10

Rev. 11/09/2000

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