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USB97CFDC2-01

USB Floppy Disk Controller

SMSC -> Microchip 

5 PIN DESCRIPTIONS

PIN NO.

75

69

71

67

68

76

63

77

70

73

72

74

64

65

NAME

BUFFER

SYMBOL

TYPE

DESCRIPTION

FLOPPY DISK INTERFACE

Read 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.

Write

Data

nWDATA

OD12

This active low high current driver provides the

encoded data to the disk drive. Each falling edge

causes a flux transition on the media. This pin is

high impedance when nRESET is active low.

Head

Select

nHDSEL

OD12

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 pin is high

impedance when nRESET is active low.

Direction

Control

nDIR

OD12

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 pin is high impedance when

nRESET is active low.

Step Pulse nSTEP

OD12

This active low high current driver issues a low

pulse for each track-to-track movement of the

head. This pin is high impedance when nRESET is

active low.

Disk Change nDSKCHG

IS This input senses that the drive door is open or

that the diskette has possibly been changed since

the last drive selection.

DRVDEN 0 DRVDEN 0

OD12

An active low on this pin indicates a disk drive

spindle speed change from 300 RPM to 360 RPM

or 1.2M format disks in three mode drives. This

pin should be tied to the disk drives spindle speed

control input pin. This pin is high impedance when

nRESET is active low.

DRVDEN 1 DRVDEN1

OD12 Reserved for future use.

Write Gate nWGATE

OD12

This active low high current driver allows current to

flow through the write head. It becomes active just

prior to writing to the diskette. This pin is high

impedance when nRESET is active low.

Track 0

nTRK0

IS This active low Schmitt Trigger input senses from

the disk drive that the head is positioned over the

outermost track.

Index

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.

Write Protect nWRTPRT

IS This active low Schmitt Trigger input senses from

the disk drive that a disk is write protected. Any

write command is ignored.

Motor On 0 nMTR0

OD12

This active low open drain output selects motor

drive 0. This pin is high impedance when nRESET

is active low.

Drive Select 0 nDS0

OD12

This active low open drain output selects drive 0.

This pin is high impedance when nRESET is active

low.

SMSC DS – USB97CFDC2-01

Page 8

DATASHEET

Rev. 02-27-07

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