FDC37C78(2000) View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
FDC37C78 Datasheet PDF : 82 Pages
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DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
BUFFER
SYMBOL TYPE
DESCRIPTION
25, Media ID0,
26 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
nMTR1
OD20 This active low open drain output select motor
drive 0.
Idle
IDLE
OD20 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 nDS1
OD20 This active low open drain output selects drive
0.
Powerdown
PD
OD20
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.
8
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