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FDC37C78-HT Folha de dados(PDF) 8 Page - Microchip Technology

Nome de Peças FDC37C78-HT
Descrição Electrónicos  Floppy Disk Controller
Download  82 Pages
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78-HT Folha de dados(HTML) 8 Page - Microchip Technology

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DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
25,
26
Media ID0,
Media ID1
MEDIA_ID0,
MEDIA_ID1
I
In Floppy Enhanced Mode 2 - These bits are
the Media ID 0,1 inputs. The value of these
bits can be read as bits 6 and 7 of the Floppy
Tape Register.
28
Write Gate
nWGATE
OD20
This active low high current driver allows
current to flow through the write head.
It
becomes active just prior to writing to the
diskette.
15
Track 0
nTRK0
IS
This active low Schmitt Trigger input senses
from the disk drive that the head is positioned
over the outermost track.
16
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.
17
nWrite Protected
nWRTPRT
IS
This active low Schmitt Trigger input senses
from the disk drive that a disk is write
protected. Any write command is ignored.
36
nMotor On 0
nMTR0
OD20
This active low open drain output selects
motor drive 0.
37
nDrive Select 0
nDS0
OD20
This active low open drain output selects drive
0.
34
nMotor On 1
Idle
nMTR1
IDLE
OD20
OD20
This active low open drain output select motor
drive 0.
This pin indicates that the part is in the IDLE
state and can be powered down. Whenever
the part is in this state, IDLE pin is active
high. If the part is powered down by the Auto
Powerdown Mode, IDLE pin is set high and if
the part is powered down by setting the DSR
POWERDOWN bit (direct), IDLE pin is set
low.
35
nDrive Select 1
Powerdown
nDS1
PD
OD20
OD20
This active low open drain output selects drive
0.
This pin is active high whenever the part is in
powerdown
state,
either
via
DSR
POWERDOWN bit (direct) or via the Auto
Powerdown Mode. This pin can be used to
disable an external oscillator’s output.


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