DESCRIPTION OF PIN FUNCTIONS
PIN NO.
25,
26
28
NAME
Media ID0,
Media ID1
Write Gate
SYMBOL
MEDIA_ID0,
MEDIA_ID1
nWGATE
OD20
BUFFER
TYPE
I
DESCRIPTION
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.
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 active low Schmitt Trigger input senses
from the disk drive that the head is positioned
over the outermost track.
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.
This active low Schmitt Trigger input senses
from the disk drive that a disk is write
protected. Any write command is ignored.
This active low open drain output selects
motor drive 0.
This active low open drain output selects drive
0.
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.
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.
15
Track 0
nTRK0
IS
16
Index
nINDEX
IS
17
nWrite Protected
nWRTPRT
IS
36
37
34
nMotor On 0
nDrive Select 0
nMotor On 1
Idle
nMTR0
nDS0
nMTR1
IDLE
OD20
OD20
OD20
OD20
35
nDrive Select 1
Powerdown
nDS1
PD
OD20
OD20
8
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