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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 read ou t fro m the disk is tran sferred to the host system
in the same form as i t was recei ved on the Write Data line. Each flux
reversal sensed on the disk pro duces 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