user manual

SEMA ELECTRONICS CO.,LTD
FLOPPY DISK DRIVE SPECIFICATION
PAG E 20
MODEL
SFD-321B
5.4.2 Track 00
"LOW" level of this signal indicates the head is on Track 00 position
and stepping motor is at the specified position respectively.
5.4.3 Write Protect
When a write-protected disk is inserted, this signal becomes "LOW"
and the data on the disk is protected from mis-erasing and
the write operation is inhibited.
5.4.4 Read Data (MFM)
Read Da ta re ad o ut from the d isk is transferred to the ho st system
in the same form as it was received on the Write Data line. Each flux
reversal sensed on the d isk produces the only transition from "HIGH"
level to "LOW" level. For the seperation of the clock bits from the data,
the leading edge of a change from "HIGH" to "LOW" level is used.
400 ns
±
20 %
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