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The timing chart for the Direction signal and Step signal is shown below.
MOTORON---
I
I
---;oJ
""'r---""""-5"'M""'i-O-.
--->j-
[.-'"5 Mio.
U
U
-I
STEP
DRIVE
SElECT---~Ii-
...J
DIRECTION---~
-l
~
'"5 Mm
1J
'"5 Mio
/""
t
:or
25mS Mm
t
=
seek time, 6mS Min.
Figure C-28. Timing Chart for the Direction and Step Signal
In writing or reading data, it is necessary to wait for seek
+
settling time after the final step signal to stabilize the head.
2-5-4 WRITE GATE Signal
When the WRITE GATE input signal line of this circuit is low, the write circuit is made operable. However, writing will
not occur, when the WRITE PROTECT output signal line is low (in a write disable state) or the corresponding FDD is not
selected by the DR IVE SELECT signal line. When this input signal line is high, the FDD is in the read mode.
2-5-5 WRITE DATA Signal
This input signal line is used to transfer data to be written onthedisk. When the FM-or MFM·modulated signal turns from
"high" to "low" level, reverse current flows through the head to generate magnetic flux changes in it to write data on the
disk. This input signal line is valid only when the WRITE GATE and DRIVE SELECT input signal lines are low and the
WR ITE PROTECT output signal line is high.
C-25
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