FDC37C665GT(1994) Ver la hoja de datos (PDF) - SMSC -> Microchip

Número de pieza

componentes Descripción

Lista de partido

FDC37C665GT
(Rev.:1994)

High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers

SMSC -> Microchip 

PIN NO.

NAME

39 Parallel Port

Interrupt

Request 1

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

PINTR1

O24 This interrupt from the Parallel Port is

enabled/disabled via bit 4 of the Parallel

Port Control Register.

Refer to

configuration registers CR1 and CR3 for

more information.

OD24

If EPP or ECP Mode is enabled, this output

is pulsed low, then released to allow sharing

of interrupts.

57 Reset

RST

IS This active high signal resets the

FDC37C665GT and must be valid for 500

ns minimum. The effect on the internal

registers is described in the appropriate

section. The configuration registers are not

affected by this reset.

In the

FDC37C666GT, the falling edge of reset

latches the jumper configuration. The

jumper select lines must be valid 50 ns prior

to this edge.

FLOPPY DISK INTERFACE

16 nRead Disk Data nRDATA

IS Raw serial bit stream from the disk drive,

low active. Each falling edge represents a

flux transition of the encoded data.

10 nWrite

Gate

nWGATE

OD48

This active low high current driver allows

current to flow through the write head. It

becomes active just prior to writing to the

diskette.

9 nWrite

Data

nWDATA

OD48

This active low high current driver provides

the encoded data to the disk drive. Each

falling edge causes a flux transition on the

media.

11 nHead

Select

nHDSEL

OD48

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.

7

Share Link: