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SEMA ELECTRONICS CO.,LTD
FLOPPY DISK DRIVE SPECIFICATION
PAG E 18
MODEL
SFD-321B
5.3.3 Motor On
Logical "LOW" level of this signal makes the spindle motor be turned on.
The motor reaches to the rated rotational spee d within 500 ms after this
signal changes to "LOW".
This input signal is ignored when no disk is installed.
5.3.4 Direction Select
This signal specifies the moving direction of the R/W head when the Step
input is activated.
Logical "LOW" level : the direction to the inner tracks of a disk.
"HIGH" level : the direction to the outer tracks of a disk.
5.3.5 Step
This is a control signal to move the R/W head, and the head starts
movingattherisingedgeoftheStepsignal.
5.3.6 Write Data(MFM)
Each time th is sig nal changes from "HIGH" level to "LOW" level,
the direction of the current flowing into the R/W head is reversed,
and the data bit is written on the disk.
3msMin.
0.15
㎲
Min.
0.15 ~ 1.1
㎲
Tw
Ta
±
0.5 % Tb
±
0.5 %
Tc
±
0.5 %
Density Mode
Ta (
㎲
)
(Typ.)
Tb (
㎲
)
(Typ.)
Tc (
㎲
)
(Typ.)
Density Transfer Rate
1.0MB 250 kbps 4 6 8
1.6MB 500 kbps 2 3 4
2.0MB 500 kbps 2 3 4