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FDC37C665GT

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

SMSC -> Microchip 

PIN NO.

NAME

7 nDirection

Control

8 nStep Pulse

17 nDisk Change

4,3 nDrive Select

O,1

98 nDrive Select 2

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

nDIR

OD48

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.

nSTEP

OD48

This active low high current driver issues a

low pulse for each track-to-track movement

of the head.

nDSKCHG

IS 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.

nDS0,1

OD48 Active low open drain outputs select drives

0-1. Refer to Note 2.

nDS2

OD48 Active low open drain output selects drives

2. Refer to Note 2.

nDrive Select 3 nDS3

OD48 In non-ECP mode: Active low open drain

output selects drive 3. Refer to Note 2.

PDIR

PDIR

97 nDrive Select 3 nDS3

O4

0D48

This bit is used to indicate the direction of

the Parallel Port data bus. 0 = output/write

1 = input/read

In non-ECP mode: Active low open drain

output selects drive 3. Refer to Note 2.

I/O Address 10 A10

2,5 nMotor On 0,1 nMTR0,1

96 nMotor On 2

nMTR2

I

OD48

OD48

In ECP Mode, this pin is the A10 address

input.

These active low open drain outputs select

motor drives 0-1. Refer to Note 1.

Motor On 2: Refer to Note 1.

99 nMotor On 3

nPDACK

nMTR3

I

OD48

In ECP Mode, nMTR2 is the Parallel Port

DMA Acknowledge input. Active Low.

Motor On 3: Refer to Note 1.

PDRQ

O24 In ECP Mode, MTR3 is the Parallel Port

DMA Request output. Active High.

8

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