Samsung SFD-321B

SEMA ELECTRONICS CO.,LTD

FLOPPY DISK DRIVE SPECIFICATION

PAGE 18

MODEL SFD-321B

5.3.3 Motor O n

Logical "LOW" level of this signal makes the spindle motor be turned on.

The motor reaches to the rated rotational speed within 500 ms after this

signal c hanges to "LOW".

This input signal is ignored when no disk is installed.

5.3.4 Direc tion Select

This signal specifies the moving direction ofthe R/W head when the Step

input is activated.

Logical "LOW" level : the direction to the inner tracks of a disk.

"HIGH" lev el : the directio n to the outer trac ks of a disk.

5.3.5 Step

This is a co ntrol signal to mo ve the R/W he ad, and the head s tarts

movingattherisingedgeoftheStepsignal.

5.3.6 Write Data(MFM )

Each time this signal 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 onthe disk.

3msMin.

0.15 ㎲Min.

0.15 ~ 1.1 ㎲

Ta±0.5 % Tb±0.5 % Tc±0.5 %

Density Mode Ta (㎲)

(Typ.)

Tb (㎲)

(Typ.)

Tc (㎲)

(Typ.)

Density TransferRate

1.0MB 250 kbps 4 6 8

1.6MB 500 kbps 2 3 4

2.0MB 500 kbps 2 3 4