FDC37C669FR 데이터 시트보기 (PDF) - SMSC -> Microchip

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FDC37C669FR

Super I/O Floppy Disk Controller with Fast Infrared Support

SMSC -> Microchip 

QFP

PIN

NO.

35

NAME

Terminal

Count

19,

37-40,

Interrupt

Request

A, C, D,

E, F

27 Chip Select

Input

57 Reset

16 nRead Disk

Data

10 nWrite

Gate

9 nWrite

Data

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TC

IRQ_A

IRQ_C

IRQ_D

IRQ_E

IRQ_F

BUFFER

TYPE

I

O24

DESCRIPTION

This signal indicates to the chip that

DMA data transfer is complete. TC is

only accepted when nDACK_x is low. In

AT and PS/2 Model 30 modes, TC is

active high and in PS/2 mode, TC is

active low.

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.

OD24

If EPP or ECP Mode is enabled, this

output is pulsed low, then released to

allow sharing of interrupts.

nCS

I

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

IS

This active high signal resets the chip

and must be valid for 500ns minimum.

The effect on the internal registers is

described in the appropriate section.

The configuration registers are not

affected by this reset.

FLOPPY DISK INTERFACE

nRDATA

IS

Raw serial bit stream from the disk drive,

low active. Each falling edge represents

a flux transition of the encoded data.

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.

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.

7

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