FDC37C669 datasheet(8/164 Pages) SMSC

8 / 164 page

DESCRIPTION OF PIN FUNCTIONS

QFP/

TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

Direction

Control

nDIR

OD48

This

high

current

low

active

output

determines

the

direction

the

head

movement.

A logic "1" on this pin means

outward motion, while a logic "0" means

inward motion.

nStep Pulse

nSTEP

OD48

This active low high current driver issues a

low pulse for each track-to-track movement

of the head.

Disk Change

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.

4,3

nDrive Select

O,1

nDS0,1

OD48

Active low open drain outputs select drives

0-1.

2,5

nMotor On 0,1

nMTR0,1

OD48

These active low open drain outputs select

motor drives 0-1.

DRVDEN0

OD48

Indicates the drive and media selected.

Refer

configuration

registers

CR03,

CR0B, CR1F.

nWrite

Protected

nWRTPRT

This active low Schmitt Trigger input senses

from the disk drive that a disk is write

protected. Any write command is ignored.

wTrack 00

nTRK00

This active low Schmitt Trigger input senses

from the disk drive that the head is

positioned over the outermost track.

nIndex

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.

DRVDEN1

DRVDEN 1

OD48

Indicates the drive and media selected.

Refer

configuration

registers

CR03,

CR0B, CR1F.

SERIAL PORT INTERFACE

Receive Data 2

RXD2/IRRX

Receiver serial data input for port 2. IR

Receive Data

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