FDC37C669-MT datasheet(8/162 Pages) MICROCHIP

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DESCRIPTION OF PIN FUNCTIONS

QFP/

TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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-

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

to 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

to configuration registers CR03, CR0B, CR1F.

SERIAL PORT INTERFACE

Receive Data 2

RXD2/IRRX

Receiver serial data input for port 2. IR

Receive Data

Transmit Data 2

TXD2/IRTX

O24

Transmit serial data output for port 2. IR

transmit data.

Receive Data 1

RXD1

Reciever serial data input for port 1.

Transmit Data 1

TXD1

024

Transmit serial data output for port 1.

FDC37C669-MT Datasheet(PDF) 8 Page - Microchip Technology

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