FDC37C669 datasheet(7/164 Pages) SMSC

7 / 164 page

DESCRIPTION OF PIN FUNCTIONS

QFP/

TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

19,

37-40,

Interrupt

Request

A, C, D,

E, F,

IRQ_A

IRQ_C

IRQ_D

IRQ_E

IRQ_F

O24

OD24

The interrupt request from the logical device

or IRQIN is output on one of the IRQA-G

signals. Refer to the configuration registers

for more information.

If EPP or ECP Mode is enabled, this output

is pulsed low, then released to allow sharing

of interrupts.

Chip Select Input nCS

When enabled, this active low pin serves as

an input for an external decoder circuit

which is used to qualify address lines above

A10.

Reset

RESET

This active high signal resets the chip and

must be valid for 500 ns minimum.

The

effect on the internal registers is described

the

appropriate

section.

The

configuration registers are not affected by

this reset.

FLOPPY DISK INTERFACE

nRead Disk Data nRDATA

Raw serial bit stream from the disk drive,

low active. Each falling edge represents a

flux transition of the encoded data.

nWrite

Gate

nWGATE

OD48

This active low high current driver allows

current to flow through the write head.

becomes active just prior to writing to the

diskette.

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.

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.

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