Index
Active low output signal which is at an active level each time
the index hole is sensed. This signal is active for one pulse each
disk revolution to indicate the beginning of a track. Index
should be held active when no flexible disk is inserted in the
system.
Motor On
Active low input signal to turn the motor on. Time is allowed
by the system before reading or writing to allow the motor
to start. The line is deactivated after 2 seconds (nominal) fol
lowing the last command. This turn off signal may be varied
by the host system depending on application.
Direction Select
Input signal to define the direction the heads move when
the Step line is pulsed. Active low causes the head to move
toward the center of the disk. Active high causes the head to
move toward the outside of the disk.
Step
Active low input signal to move the head in the direction
specified by Direction Select. Minimum pulse width for step
is 0.8m s. Direction Select is not changed within 1ms on each
side of the trailing edge of Step. Each step pulse is delayed
by 6ms from the preceding step.
Write Data
Input signal to provide the data to be written on the flexible
disk. Each transition from high to low causes the current
through the read/write heads to reverse, causing a data bit to
be written. This line is enabled by Write Gate active. Write
Data is not active during a read operation. Write pulse width
for both data bit and clock pulse shall range more than 0.25ms.
Write Gate
Active low input signal to enable data to be written on the
flexible disk. Write Gate not active enables the stepper logic
and read data logic.
Track 00
Active low output signal to indicate when the read/write heads
are positioned at track zero. Track 00 is not active when the
read/write heads are not at track zero.
Write Protect
Active low output signal to indicate when a write protected
disk is installed in the drive. The drive inhibits writing and
provides the write protect signal.
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