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FDC37C669FR

Super I/O Floppy Disk Controller with Fast Infrared Support

SMSC -> Microchip 

QFP

PIN

NO.

11

7

8

17

4,3

2,5

1

14

13

DESCRIPTION OF PIN FUNCTIONS

NAME

nHead

Select

SYMBOL

nHDSEL

Direction

Control

nDIR

nStep Pulse nSTEP

Disk Change nDSKCHG

nDrive Select nDS0,1

O,1

nMotor On 0,1 nMTR0,1

DRVDEN0

DRVDEN0

nWrite

Protected

nWRTPRT

wTrack 00

nTRK00

BUFFER

TYPE

OD48

OD48

OD48

IS

OD48

OD48

OD48

IS

IS

DESCRIPTION

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 accessed.

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.

This active low high current driver issues

a low pulse for each track-to-track

movement of the head.

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.

These active low open drain outputs

select drives 0-1.

These active low open drain outputs

select motor drives 0-1.

Indicates the drive and media selected.

Refer to configuration registers CR03,

CR0B, CR1F.

This active low Schmitt Trigger input

senses from the disk drive that a disk is

write protected. Any write command is

ignored.

This active low Schmitt Trigger input

senses from the disk drive that the head

is positioned over the outermost track.

12 nIndex

nINDEX

IS

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.

8

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