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FDC37C665GT Datasheet(PDF) 8 Page - SMSC Corporation

No. de pieza FDC37C665GT
Descripción Electrónicos  High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
Download  152 Pages
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Fabricante Electrónico  SMSC [SMSC Corporation]
Página de inicio  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37C665GT Datasheet(HTML) 8 Page - SMSC Corporation

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8
DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
7
nDirection
Control
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.
8
nStep Pulse
nSTEP
OD48
This active low high current driver issues a
low pulse for each track-to-track movement
of the head.
17
nDisk 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. This
input is inverted and read via bit 7 of I/O
address 3F7H.
4,3
nDrive Select
O,1
nDS0,1
OD48
Active low open drain outputs select drives
0-1. Refer to Note 2.
98
nDrive Select 2
nDrive Select 3
PDIR
nDS2
nDS3
PDIR
OD48
OD48
O4
Active low open drain output selects drives
2. Refer to Note 2.
In non-ECP mode: Active low open drain
output selects drive 3. Refer to Note 2.
This bit is used to indicate the direction of
the Parallel Port data bus. 0 = output/write
1 = input/read
97
nDrive Select 3
I/O Address 10
nDS3
A10
0D48
I
In non-ECP mode: Active low open drain
output selects drive 3. Refer to Note 2.
In ECP Mode, this pin is the A10 address
input.
2,5
nMotor On 0,1
nMTR0,1
OD48
These active low open drain outputs select
motor drives 0-1. Refer to Note 1.
96
nMotor On 2
nMTR2
nPDACK
OD48
I
Motor On 2: Refer to Note 1.
In ECP Mode, nMTR2 is the Parallel Port
DMA Acknowledge input. Active Low.
99
nMotor On 3
nMTR3
PDRQ
OD48
O24
Motor On 3: Refer to Note 1.
In ECP Mode, MTR3 is the Parallel Port
DMA Request output. Active High.


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