Computer Drive User Manual

SEMA ELECTRONICS CO.,LTD
FLOPPY DISK DRIVE SPECIFICATION
PAG E 19
MODEL
SFD-321B
5.3.7 Write Gate
"LOW" level of this signal enables the write data to be written on the disk
provided that the drive is selected, disk used is not write protected and
seek operation is completed.
When this signal changes to "HIGH" level, the read or seek operation
becomes possible.
5.3.8 Side Select
This signal se le cts the side of Heads.
Logical "HIGH" level : the lower side (side 0) of Heads
"LOW " level : the upper side (side 1) of Heads
5.4 Output Signals
5.4.1 Index
This is a pulse signal output to indicate the start of the track, and it
outputs a t every revolution o f the disk.
This output signal is activated when only the drive is in Ready state.
<Note>
( *1) The value in paren thsis is for 360 rpm (1.6MB Mode ) rotation speed.
100
㎲
Min.
650
㎲
Min.
100
㎲
Min.
100
㎲
Min.
650
㎲
Min
valid
valid valid
valid
WRITE GATE
SIDE SELECT
READ DATA
1
∼
8ms
200
±
3ms
(166.7
±
2.5 ms )(*1)