FDC37C665IR Ver la hoja de datos (PDF) - SMSC -> Microchip

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FDC37C665IR

3/5 Volt Advanced High-Performance Multi-Mode™ Parallel Port Super I/O Floppy Disk Controller with Infrared Support

SMSC -> Microchip 

PIN NO.

NAME

10 nWrite

Gate

9 nWrite

Data

11 nHead

Select

7 Direction

Control

8 nStep Pulse

17 Disk Change

4,3 nDrive Select

O,1

97 nDrive Select 3

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

nWGATE

OD20

This active low high current driver allows

current to flow through the write head. It

becomes active just prior to writing to the

diskette.

nWDATA

OD20

This active low high current driver provides

the encoded data to the disk drive. Each

falling edge causes a flux transition on the

media.

nHDSEL

OD20

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 ac-

cessed.

nDIR

OD20

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.

nSTEP

OD20

This active low high current driver issues a

low pulse for each track-to-track movement

of the head.

nDSKCHG

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.

nDS0,1

OD20 Active low open drain outputs select drives

0-1. Refer to Note 2.

nDS3

0D20 In non-ECP mode: Active low open drain

output selects drive 3. Refer to Note 2.

I/O Address 10 A10

2,5 nMotor On 0,1 nMTR0,1

96 Motor On 2

nMTR2

I

OD20

OD20

In ECP Mode, this pin is the A10 address

input.

These active low open drain outputs select

motor drives 0-1. Refer to Note 1.

Motor On 2: Refer to Note 1.

nPDACK

I

In ECP Mode, MTR2 is the Parallel Port

DMA Acknowledge input. Active Low.

7

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