FUJITSU MPF3XXXAT - Manual (Page 61)

C141-E099-01EN 4 - 16
4.7.3 Servo frame format
As the servo information, the drive uses the two-phase servo generated from the gray code and
Pos A to D. This servo information is used for positioning operation of radius direction and
position detection of circumstance direction.
The servo frame consists of 6 blocks; write/read recovery, servo mark, preamble, gray code,
Pos A to D and PAD. Figure 4.6 shows the servo frame format.
POS
C
PAD
POS
D
POS
B
POS
A
2.12
µ
s
0.78
µ
s
0.84
µ
s
0.84
µ
s
0.84
µ
s
0.92
µ
s
0.80
µ
s
0.26
µ
s
0.24
µ
s
1.08
µ
s
W/R Recovery Field
Preamble ASM SSM
Servo
Frame
DATA DATA DATA
Servo
Frame
115.7
µ
s
8.76
µ
s
SCD
Figure 4.6 Servo frame format